Hi, S.:
What were the expectations you gave to the babysitter when she took the job?
Did you have them written down for her to follow
For example:
Do not take my child out in the car.
If you have any questions or concerns about
health and safety, call me immediately.
etc.
If you didn't have a set of expectations then you need
to sit down and write up some with her present.
The frontal lobe does not develop until 25 years of age.
You need to set down rules for young people because
they are not able to reason things out like an adult.
People get babysitters because they are young and inexpensive to hire.
You need to take responsibility for the care of your 3 month old.
Good luck in the future.
D.