it is stressful enough that you have been through a work related dipute with her, but this really constitutes harrasment and stalking. she has purposefully sought you out at a private place with intent of pursuing her greviance
does she have a line manager you can report to
do you have a line manager to support you
document this with date and time
is she regulated by a professional body consider reporting her, does this followinng and harrasment constitute professional misconduct
report to nursery that she is harrassing you
dreadful to go through this