She told the truth.

As much as you suspect Trish in lying to you, you can't deny the memories that flow into your mind. You carefully look through them trying to catch an single hint of lie. But in the end everything that you acknowledge of Trish's intents and thoughts seems to prove her words truthful. The amount of received information makes you stand become wobbly, so you drop your butt onto the bed.

You press your hand against the aching forehead. It's not that this is a migraine from the memories (Although it is), but from the complicated feelings boiling inside you. The only question is basically shouting through your own thoughts. "What should I do?!"

Then, like a thunder, idea popped in your conflicted mind. "What if I could discuss it with someone? Maybe that would be easier and just?" Although this idea in theory was great, it also seemed too naive to be possible. It would be too dangerous to reveal secret of such tools to third person and may cause some problems in trust and secrecy of this whole situation. But what about those who was turned into skinsuit? Like Jessica? This way it makes it complicated to act objectively right as there comes the victim's decisions that could lead to more unstable course of the events. And here comes the last variant that comes to mind.(At least for now) Turn Trish back to normal and act from there. The scan of her memories also made it clear that she would've done literally anything to make her dream come true, so it's 50/50 situation.

On one hand she would try to take back the pens and try to get her idea to come true according to her original plan. With pens she then would be cautious of you and never let you get a hold of them again and no one would believe you of such absurd idea of your girlfriend being possessed by someone else.

On the other hand she could really help. It would only work if she wants to keep at least some kind of good relationship. This way she might cooperate and give a hand of what both of you should do next. But, once again, it is not guaranteed. Once she turned your girlfriend into skinsuit. There is no guarantee she wouldn't do something similar again.