Crotch grabbing, kissing, getting nude, none of that will save you from a charge.
Law Enforcement can lie & will lie, & females during a sting are always scared, so don't do anything that would make her feel endangered and necessitate back-up intervention.
What will save you from a charge is carrying donation on a visa/amx/mastercard gift card, refraining from abbreviations/explicit talk/subtle hints at activities, not bringing condoms, & not having a prior arrest for whatever charges are related.
They will bust you for arriving with the cash, for comments made, & for showing up.
Charges won't always stick if the only thing you did wrong was show up.
The photo verification that the provider was asking for was so she knew who to expect when you arrived.
Some folk have done a buddy system where they share a burner phone & ter account for easy peasy screening & group access to reviews. Sometimes TER bans for multiple IPs, sometimes nothing happens to trip the wire & the account stays open.
I personally request ID from folks without references, or whose references can't verify them. I'm reviewed, but I'm also a jaded, angry see-you-next-tuesday who is done with getting taken advantage of by "nice guys".
If giving a pic makes you uncomfortable, imagine how she will feel if you pressure her into showing up without the photo...
Extremely Uncomfortable.
Chances are that much like me, your young lass has also had a bad time & is just trying to count her chickens before they hatch.
Such is life.
Potato.