Carol had always been a person who knew her limits. After obtaining her superpower, she spent most of her time hiding and didn't dare expose herself.
She was reluctant to let someone else risk their life for her, even if this Mr. Mysterious had said several times that it was for the money.
After being on the run together for a year, Carol would've pleaded for Lorna's rescue if the latter had been caught.
As for the others, she had known them for less than two months. She couldn't say that they were very close, and could only apologize.
She didn't believe it when Lorna and the others kept going on about how superhumans were all family.
When she was still an ordinary person, she had been killed by ordinary gang members, but it was another ordinary person like Luke who had helped her out.
So, she felt that "family" had nothing to do with superpowers.
The "family" in her heart wasn't that cheap.