And all that they agreed to was a vote on ACA subsidies on a later date. There is zero chance those subsidies are approved when that vote occurs.

Unproblematic?

It means that whatever she tells authorities during interviews won’t be used against her. It’s not a a reduction in her sentence. It is part of an effort to obtain a reduced sentence, however: if she can show knowledge of crimes, and is willing to testify, she might be able to obtain a deal.