Mothervine from what we've causes secondary mutations so that a mutant's powers evolve beyond what they were initially. Say Dani is repowered via Mothervine; what should her secondary mutation be? I have a couple of ideas
1. How about make her a true empath. Initially she could instill fear by psychically pulling out her targets greatest fear. How about if her powers are more innate in that she can manipulate any type of emotion independent of psychically creating mirages from their minds?
2. Make her a true illusionist like Mastermind. She can create illusions to a limited degree by making realistic imagery from her target's memories but extend that so she can create anything with her imagination
3. Give her a psimatar like Cable had in the 90s but have it be something she can create from within herself. It would be a cool melee weapon to use and it would allow her to absorb and convert ambient psychic energy into physical form