Depending on what bottle it is some have handles you can add. Maybe she just needs that extra help. Like Dr browns and avent have handles you can buy. I did that with my older baby and he’s 2 now. Maybe try that!
At 13 months you can also switch to sippy cups. Munchkin 360 are great or the Zak Kelso cups.
Are you looking for the December 2023 group? Our babies are like 3 months old 😅