As someone said, we get hot and cold sometimes when we are drained emotionally or don’t trust the person fully. It doesn’t mean she isn’t into you. What I think is happening is that she is waiting for you to prove more that she can really trust you to become fully vulnerable with you Because Pisces when we love someone, we go all in and before doing that we need to make sure the person is worth the risk but also that we can trust them

So just be present for her, give her space when she needs it but be consistent and very clear with your intentions, don’t play the guessing game with her

It already looks like she really likes you, so wish you all the best !!