At my wits end

If she wants to roll to get comfy let her. If she gets stuck she will let you know. Something that really helped me with my first and I still use it now she's 2 is, if you cant get them down in 20 mins give up and do 30 mins for something high energy for babies this age something highly stimulating has the same effect, then do a calm down 10 mins, book, low lights and try again and just repeat. 9 times out of 10 they go down after the first burst. You might have also hit the 6 month sleep regression which may just be pot luck what work and what doesn't just try keep your lead up to put down the same or as similar as possible else it can get worse (we found out the hard way with our first😬)

Have you tried a bath right before the last bottle ? I find my twins will be KO’d before the bottle is even finished !