If she's that mentally ill, that 'take your meds' needs to be in the CO, and she has extreme highs and lows like this frequently, I would call any time something like this happens. He is three years old, he can't be locked in rooms. Make a list of what happened today, what she said, the brusies, if it has ever happened before, Ect. Just call and see what CPS says, then it will at least be on record for the next time something happens. Sounds like she needs to have supervised visitation. She clearly can't handle him on her own.
We document everything - every early exchange, every cancelled visit, every negative text message, phone call, email.
She just got off of supervision within the past year, after extensive psychiatric evaluations (FI's side trying to get her declared unfit), and a recommendation of the doctor that she have 33% and unsupervised.
You're right, she clearly can't handle him on her own. It's also in the CO that they co-parent, and not harm the relationship with the other parent.
Would calling CPS because of a statement be seen as trying to damage the relationship? Not defending her, but I'm thinking back on all the things my parents said.. "shape up or you'll be grounded for years...". It never happened, but the thought of it made me clean up my act.
If she said "I locked him in his room all day today", hell yeah, CPS would be called.