Do you have intentions of pursuing a serious relationship with this person?

If so, then I would advise you to wait a bit and meet up at least a few more times before going on a psychedelic journey. If something happens and she has a bad trip, major strain can be put on the relationship you do have. If she has never indulged in mushrooms before, there is a possibility she will go super deep, become incredibly paranoid, or even have an existential crisis.

While of course we all want her to have a fun, giggling trip with you, you must also be prepared if things go awry.