Hi mummy, I was also in the same position as you few months back and very worried on how to cope when nanny leaves. Rest assured baby will get used to you once she leaves as you will now be the primary caregiver and meeting his/her needs.
I made the mistake of extending my nanny by 2 weeks as I was so afraid I won’t be able to cope. Everything turned out fine after a week of getting a routine in place and sticking to it.
Don’t forget the nanny is still an outsider and the silver lining is you can now regain control of your baby and house again and implement a routine you feel is best for baby, yourself and your family.