[Nevadaref]

First, welcome to the forum.
Second, if you are willing to take some criticism, you will learn a lot.
Third, I will now correct all of the inaccurate statements in your first post. Basically, the stuff that you think that you know, but you really don't know.

Originally Posted by derwil

Once the players leave the confines of the court, they are considered bench personnel.

Not true. Players become bench personnel when they are replaced by a substitute, during an intermission between quarters, or when the Head Coach is notified of their disqualification.
Here's an old play ruling from the NFHS which demonstrates why what you have written above is incorrect:
1999-2000 NFHS Basketball Rules Interpretations
SITUATION 6: Player A4 leaves the playing floor before her substitute has an opportunity to report to the scorer’s table. During which time, player A4 disrespectfully addresses the nearest official.
RULING: The official assesses a technical foul on player A4. There is no indirect technical foul charged to the head coach because A4 has not been replaced and is not considered bench personnel. (3-3-3, 4-34-1, 2, 3)

Originally Posted by derwil

So far as I know, there are no restrictions on bench personnel movement other that standing up while play is on the court.

Now you know differently.

2005-06 POINTS OF EMPHASIS
1. Sporting Behavior. The NFHS Basketball Rules Committee continues to be concerned with player, coach and fan behavior. While administrators continue to focus on solutions, it is imperative that all parties involved accept responsibility and improve behavior. Specifically, the committee wants the following addressed:
...
B. Time-outs: When a team goes on a scoring run, emotions often run high. Nationwide, there is an apparent increase in bench personnel running out onto the court after a time-out is whistled. Typically, the bench personnel of the team that has gained momentum run out onto the court to celebrate and congratulate their teammates. The other team's players, heading toward their bench area, often cross with the celebrating team. This situation often leads to bumping, pushing and/or taunting.
Coaches must make sure that bench personnel remain in the team bench area (1-13-3) after a time-out is called. Officials must be aware of the potential for confrontation, use preventive officiating techniques and penalize appropriately.

2004-05 POINTS OF EMPHASIS
3.
A. ...The committee is also concerned about bench personnel leaving the bench, sometimes during a live ball. Heading into the hallway to get a drink or sitting up in the stands with friends or family, even for a short period of time, are not authorized reasons unless they are medically related. Coaches must ensure that bench personnel remain on the bench.

Originally Posted by derwil

I would probably ask the coach to let her know the correct substitution procedures and to exit the court towards the bench so that there is not a "delay of game" warning posted to her team.

1. There is no requirement for a player to exit the court in any particular direction. You can check the rules book, but you simply won't find anything.

2. There are ONLY four specific reasons that a delay of game warning can be issued to a team. Unless one of these four actions has occurred an official cannot charge one to a team.

RULE 4, SECTION 47 WARNING FOR DELAY

A warning to a team for delay is an administrative procedure by an official
which is recorded in the scorebook by the scorer and reported to the coach:

ART. 1 . . .

For throw-in plane violations, as in 9-2-10, 10-1-5c.

ART. 2 . . .

For huddle by either team and contact with the free thrower, as in
10-1-5d.

ART. 3 . . .

For interfering with the ball following a goal as in 10-1-5e.

ART. 4 . . .

For failure to have the court ready for play following any time-out
as in 10-1-5f.

As you can see the action described above is not one of these four, so it would be incorrect to issue a warning for delay in this case.

Originally Posted by derwil

A "T" is unwarrented as this was not a disruption to the game by bench personnel.

1. Spelling counts on this forum.
2. That is your opinion, but another official may believe differently and, as already detailed above, there certainly is rules support for charging a technical foul here.

Originally Posted by derwil

Just my opinion

As a new member here, you may find that the difference between your opinions and the actual rules can be pretty amazing.

If you are willing to stick around, take some heat for your comments, and open your mind to learning new things, then the folks here will increase your rules knowledge and make you a better official.

Best wishes.