Out or award base or bases

[canump]

I was just getting to bed last night when one of our local coaches called me about a play that happened last night. Visiting team is on 3rd base side of diamond. This call did not alter game out come as his team, the home team won by 8 runs but he was just wondering.
Situation > 17,18 year old girls, 2 out with runners on 2nd & 3rd. Shallow pop fly to left feild where left feilder had to come charging towards the foul line in order to catch the fly. Angle of run was such that when catch was made she just kept running straight to gate opening for her bench. F7 had to make running shoe string type of catch, started to bobble ball immediadtely, kept running towards bench eventually trapping ball between arm and her stomach about 3 steps before gate opening. This was how she enter her bench. The plate ump who is in his 3rd year of umpiring ruled the batter out.
This was in the 6th inning with the home team up 8, coach came out not to argue the call but to get the ruleing. PU told him that since control was made before feilder entered dead ball territory the out stands. Coach figures since he's ahead, just needing 3 outs to get out of the rain that started falling the previous inning and this being a young umpire he'd let it slide.
When coach called me to get my opinion I told him I would get the PU version 1st then I would get back to him. I'm here at work so I have yet to talk to this guy so I thought I would send it out to you guys n gals to get your feed back. Me I'm thinking it's an invalid catch as control was not in glove or hand, dead ball when F7 enters dead ball area, one base award to runners, B1 on 1st.
your opinions please.