Blackthorn said
No, she kinda pissed off Emma Frost and the rest of the X-men when they tried to recruit her, and she fought them and decided to leave 'cause grown ups are dumb. Emma (in my backstory for Molly, at least) is trying to get her back, unbeknownst to Molly, and when whoever she sends after her catches up to her, the pint-sized powerhouse won't be happy. Also, would you be adverse to the surviving Runaways (specifically Nico, Chase, and Karolina) joining Infinity Inc? It makes more sense than any other team, since they're too small potatoes to be their own team with just three or four members, two of whom have powers with severe drawbacks and one who isn't even powered, unless you count his telepathic link with a genetically engineered velociraptor. Though I suppose all the teams have pretty wild power level variations.
Blossom wouldn't turn them away. So there should be no issues with that, I welcome the company.
