I agree with the others and also the thing is, it really really is something that is directly affecting you right now. your relationship with your family, flashbacks, worries about your little nieces, maybe frustration and upsetness with lots and lots of different things that are happening and affecting your life today b/c of something that happened back then.
This sounds like it definitely fits with what she said about the past, and i agree with harrietgate that your T very very likely just doesn't want to press you on it, thinking you aren't ready to talk about it.
T's know it can hurt someone to be pushed into processing trauma before they can handle it...maybe even re-traumatize them...so she likely just doesn't want to press you on it and if you're like me....i will avoid any kinds of reference to anything even remotely related to CSA, but i know she knows there is stuff there to be explored.
Maybe you could start out by talking about strained relationships with your parents, like you don't trust your mom...and kind of lead into it like that...so it doesn't feel like you're just kind of laying it out there.
or you could like write it down and just give it to her ? I do this all the time, I have a really really hard time talking but I write all these little notes during the week and give T a summary kinda thing and it helps me a LOT...I print out one copy for her and one for me and we read them together...
I don't know if this helps...But i'm sure your T wants to talk about it...T's know all about CSA and the havoc it wreaks and how it has to be dealt with and is affecting our lives in a million ways now, even though it happened way back when...

(((((((((((((((((((Jexa))))))))))))))))))))