Obstruction Revisited

[fastpitch]

As a long time coach, tournament director, administrator, expert chalk machine operator but new to umpiring would like to hear how strict your intrepretation is on obstruction, situations:

18U
#1 R1 leads off 3B, F5 playing just behind inside the baseline, Catcher throws to F5, R1 has a clear path back to 3B, remains upright, shoulder makes contact with F5 as she returns to 3B and she breaks stride, (would not call it a collision but she does stumble a bit), then ball arrives, tag applied before reaching the base, umpire calls obstruction, safe and places her back on 3B. He made a good distinct call on it with little hesitation.

#2 Let's say same as #1, R1 leaned into F5 or was off balance and veered into F5 say not quite 3 feet out of baseline.

#3 Same situation, ball arrives same time as contact - wreck?

Yes, I was in a coaching role, we are on defense and my daughter is playing 3B - I've taught fielders not to block the base, and runners to break stride/brush opponents but never to intentionally harm a fielder plus the slidebys, etc. I and my daughter in this case are confused by the extremely strict interpretation of obstruction and interested in your opinions on how strict you call it?. Shouldn't we to some extent let them play or do I as a coach need to start teaching them to play softball like tag - fielders run away from the runners and runners try to run into the fielders and vice versa after the fielder gets the ball. I'm not talking about the fielders just getting in the way because they aren't paying attention but more - how do you judge wreck versus obstruction or do you aletr your call relevant to clear path to the base.