My DD1 would wake up during the night from that age and it continued until she was over 18 months old. I had DD2 when she was just under 16 months old, so I have experienced a newborn and a toddler both waking up multiple times. My DH used to take over with DD1 and lay next to her on the floor next to her bed, and just let her sit and play for up to 4 hours a night (her normal awake time was 1am-5am and she would not be settled during this time). I then had the responsibility of the newborn during the night on my own. It was rough to say the least.

We found after MONTHS of putting up with this, that if we gave DD1 a bottle of milk she would go back to sleep no worries. Absolutely kicked ourselves after figuring that out.

So thats my only suggestion. If she drinks that bottle in the night, give it to her. My DD3 was still feeding overnight at that stage, she was breastfed though, but still woke up multiple times a night for milk.

Sorry - thats all I've got LOL