Refused Milk Bottle

Dear mummy, After she was born my baby was bottle fed all the way with my confinement nanny till now. But since yesterday she refused her bottle and want to latch. Not too sure why there is a sudden change, I only let her latch once in a while in the past. Milk supply also not sufficient enough for her one feeding too. What should I do? I still prefer to bottle fed her, how to change it back?