People do wonder if the "I wish her well." thing, which he has now said more than once, is a message. Some reporter claimed he only uses that phrase in reference to people he wants to pardon but others seem to believe he is using the phrase as a threat...that he is saying he wants her dead like Epstein. 

Maxwell's trial is not set until next summer so Trump can't pardon her because she can't be found guilty until then. Her only option right now is to cut a deal with prosecutors. The facility she is in has been described as a hell hole. It also was described as a place where it would be easy to kill her. She is being kept in isolation on a floor dedicated at the moment to just her. This is likely because she can not be exposed to other inmates who might off her. Also wise to keep her in isolation so she does not get a dose of Covid that conveniently kills her. 

One thing is for sure, Maxwell can't take being locked up where she is. She is also not happy about only being allowed to wear paper clothing. I'm sure she is begging her lawyers to get her moved somewhere else. She won't be able to take a year in there. 

Essentially, all they have to do is wait and leave her in there until she starts offering stuff for trade to move her, lower her sentence, whatever.