Invading personal space = Possible SA?

Background: Dancing Queen suffered a Traumatic Brain Injury in Oct. We got her in Dec. In between that time she was in the hospital recovering and going through intensive in-patient rehab. We assumed, based on her behaviors and lack of asking for mom or dad or any family, that her memory was basically gone, at that time. From the time she came home, she has had issues with respecting a person's personal space. She wants to be on someone/in someone's lap all the time. She is constantly in a person's face...she asks for hugs all the time, and when you try to disengage the hug, will say "But I love you..." She used to try to kiss on the mouth, and we've overcome that. She cannot sit on a couch, chair, floor, etc without touching whomever she is sitting by. She has no fear of strangers and will cry when a perfect stranger walks away after talking to her briefly in the store. We figure she has some form of disinhibited attachment disorder, possibly from having her memory basically erased and then spending three months in the hospital surrounded by lots of different nurses, and such. As time has gone on, she seems to be getting her memory back, but the above personal space issues persist and have gotten worse, in a lot of areas. She also puts her hands down her pants. We didn't really worry about that part, as exploration, as far as we knew, is a normal part of being 3 years old. Recently, she went on a 2.5 week visit to her maternal grandparents, whom she is supposed to be going to live with. When she returned, she had some behaviors, of course, as transition is hard on kids. However, the behaviors are concerning to her CASA, and now I'm wondering. Her most recent behaviors include peeing on our couch twice (She has been potty trained since the 2nd month she was here, and only peed in her bed once over night when she was really sick). And she fondled herself while sitting on the couch next to her CASA which really freaked him out. She has not fondled herself anything other time to that degree. She does still stick her hands down her pants, but usually we just tell her to stop and she does and doesn't do it again for a few days. The peeing occurred the first weekday after she came home (she came back on a weekend). It happened two mornings in a row, and that was it. When I asked her why she did it, she said "Baby", and I asked her if it was because I was taking care of the baby at the time, and she said yes. Now, the paternal grandparents (who also want her but CPS has serious concerns) are saying DQ's mom, who is now deceased (murdered by DQ's dad), revealed to them when she was alive that DQ's maternal grandpa molested her as a child. NOthing was said before this visit. So, after that long background here are my questions: 1. Does her lack of personal boundaries indicate she may have been sexual abused or molested (possibly by dad?) before she suffered her brain injury? 2. Do her recent behaviors indicate she may have been molested by her grandpa at the most recent visit? Thank you.