Exactly Hawk
Stella - I know it is not easy but you must separate the civil vs the criminal aspects in this.
The linkage comes as Hawk suggests - would she risk losing her childminder license, assuming that she has one...
I would certainly report his behaviour first thing tomorrow morning, so if you call later in the day, they, the "pollis" know that there is an issue already logged.
If you think that you do owe her, you must make contact with her (not him) and establish an amount and then take it from there with the 'history' of what services that she has performed (even allowing for under-performance)e and what you originally agreed as to termination.....