The way that ESPN reports on the story makes me think there maybe something to her claims.
Police investigate home invasion at house owned by Bills' LeSean McCoy
Article says that police were in fact contacted, and that lawyers strongly advised her to take that twitter post down. I assume because they feel they have an actual case and don't want social media to muddy the waters publicly.
Also, it says a few times the intruder asked for specific items of jewelry. And that McCoy had been trying to get the jewelry back for a while. So that's at the very least curious.
Since the cops and league are involved and investigating this, you are right when you say don't jump to conclusions based solely off of a social media post. Those are far too easily believed and ruin careers, if by no other way than casting doubt forever on a person's character.