Hi!
Wow! Thats so cool. I am a psychic too (i see spirits, auras). The best way for her to progress is by practising more and more.
"Don't use it, you lose it"
So get her to keep practising. Also another way of saying "I had another vision", she could say "I had a visit, guest, etc"
Hope i helped you
Good luck! And I hope your sister progressess