My question involves criminal law for the state of: Texas

Im in Texas. I am being accused of unlawful entry and vandalism. Or maybe it was breaking and entering instead of unlawful entry? Its was one of those, maybe even trespassing. I cant exactly remember. Anyway, even the term burglary was used. Apparently my ex-girlfriends home was broken into, they poured shampoo or soap or something everywhere and broke a cd. Her car was supposedly also keyed. She is pointing the finger at me but I wasn't anywhere near the place. The only thing they have on me is motive (i dont get along at all with her. the only tie I have with her is our son). She also has a habit of leaving the doors unlocked at all times. I know this from when we lived together and even the apartment maintenance workers know this. Shes trying to say that theres evidence but I dont see how. If shes talking about fingerprints I was there to pickup and drop off my son that day. I dont know who shes involved with now or what she does, although she did admit to drug use. It couldve been anyone. What can I do?