HELP! Breast/Bottle Weaning Battle

My daughter just turned 1 and has been breast feed since day one. We ended up needing to supplement around 5 months, but she still nursed about 80% of the time. Here's my dilemma...

Now she only wants to nurse, once or twice a day, mainly for naps, but will definitely want a bottle or nurse to go to sleep at night.

The past couple days she's been refusing her bottle at times, and rather have her sippy cup, but getting her to sleep or nap with it seems like a no go. Then she'll get overly tired and claw at my breast to nurse and of course I give in 😑

Do I just need to grow a pair and lay down the law or is there a more gentle way to do it? I know she needs to learn to soothe herself to sleep, but I want it to be as smooth of a transition as possible for both her & I.

Thanks much! Looking forward to any help I can get!