So sorry this happened and that you are having to deal with all of this and without the close support of your husband.
When my son was 32 mos old, while inside a resturaunt playland with some other kids, a five year old who was in foster care and previously the victim of abuse / sexual abuse tried to force my son to mouth his penis. My son bit him on the hip to get away, that's all we know. DS was very verbal for his age, but not able to clearly communicate exactly what did and did not happen, and it didn't help that at first the focus was on the fact that he had biten the other child without understanding and giving credit to the fact that he had done so for a reason.
I documented the incident well, informed authorities, though the police were not involved.
The first few weeks into months were very hard. For one, I lived in fear of his new vocabulary and where / when it may surface, but mostly it was the heartbreak and trying to do the best thing for my son, not knowing what that meant. I wanted to give him the support he needed, but at the same time, I didn't want to focus too much on it...I hoped it would fade from memory so I didn't want to do anything to focus his thoughts on the event if that wasn't what he needed. For the first week or so, he would say various things a few times daily, then only once a day, usually during our 'winding down for bedtime' conversations, then it was only an occosional comment and now at 4 yrs of age, I think it's been at least 8 months since he's said anything. DS has an excellent memory, don't know if he remembers or not (suspect he does) but we have worked to avoid that playland so as to not refresh the memory.
Anyway, now close to 18 mos. after the fact, it seems to have had little impact. Though I know that we are all impacted in little ways that we do not understand, I feel pretty confident that this event is not going to have strong lasting effects.
Best wishes to your daugher and your familiy.