Help- Night sleeping and transitioning to formula

Looking for some advice- my daughter is 9 months old and EBF, I have now gone back to work so 3 days a week she’s in childcare and refuses to take a bottle she just goes without (I have tried a sippy cup) She eats very well during the day but still wakes 3 times to be breastfed during the night.

I want her to start sleeping through the night & I have a few things coming up where i will be away for a few nights at a time so I feel my only option is to get her to take the bottle.

Any suggestions on how I can get her to take a bottle & sleep through the night

Thank you 😊