65 is pretty cold for a crested gecko honestly - they need it quite a bit warmer. That could definitely be affecting her appetite. What's her actual temp in the enclosure?
Have you noticed if she's more active or chill when you're in there making noise versus when it's quiet? That might tell you whether she actually needs the stimulation or just got used to it.
what's worked for me is reptisoil as a base, then mixing in whatever husk and moss til it feels right—good drainage but still holds moisture. honestly the specific brands matter way less than people make it sound
Yeah that's a tricky one. When they're hungry but just can't keep food down, that usually needs a vet to sort out — it's hard to narrow down just from observation at home.