Live-in compensation

Hi there seeking advice for nanny live in comp.. some people tend to pay full hourly rates and some tend to take into consideration the nanny does not have to pay rent or utilities wifi or for food so the pay is less.. we currently pay our live in nanny 850/week and she is “on call” from 7-7 but she usually only works 745/8-6 sometimes stops at 4.. she doesn’t really do what she’s supposed to do (leaves dirty bottles after her shift, doesn’t clean up pots and pans she uses, constantly on her phone with our baby around despite multiple asks not to, pulling all nighters on dates with guys and then taking care of our baby next day- we are going to let her go- she has taken advantage of us being cool with her- lied about being sick and then went for q fun day in nyc, etc etc ) ovand it’s getting frustrating . We want to look for a new nanny - she has lied several times about innocuous stuff..: I just wanted to know if this pay is fair or if we should expect to pay more . Thank you for feedback this is our first time!