It would be more believable if she wasn't working with her mother, but working for her mother, behind her back. I think Meredith genuinely cares about her daughter, and wouldn't approve of her living a life of debauchery, and risking her life, so she could betray MC. On the other hand, it's possible that Chandra could betray MC on her own volition, as an ulterior motive, thus subjecting herself to all those "trials"so she could achieve her own objective: helping her mother without her knowledge.
I think it's unlikely, because it looks like Chandra acts like that towards her mother just out of spite. But still, I suppose it could be just an act and she could be behaving like that because she would know her mother would never allow her to help any other way. Now, this could be a good plot twist, imho.
