cot gymnastics

[RVF400]

6 month old DD moves around A LOT in her cot at night, when she's asleep. We call her godzilla: we can hear the thumps when we're watching telly in the evenings (her room is above the lounge). This wouldn't be such a problem except she eventually gets something stuck against the bars of the cot and wakes up.... and this happens 3 or 4 times a night . She particularly likes to rotate through 90 degrees for some reason, but she is now slightly longer than the cot is wide so this results in her head and feet hitting the bars, and usually getting stuck.
We'd just managed to get her down to 1 feed a night before this started so now sleep deprivation is back and it feels like we're going backwards.
I was wondering if it would be worth buying a bigger cot: we just have an old fashioned standard sized one, and I've seen some friends with cotbeds that are significantly larger. Do you think this would help or would she just move further until she hit the "new" side?
I'm also tempted to try cot bumpers but I know the current advice is that they increase the cot death risk, so not sure.
Does anyone have any advice or experience they could share please?

Hi, i can really recommend the mesh cot bumber from Jo Jo Mamen. We purchased is to stop DS from getting his arms and legs stuck and so that his dummies stayed in the cot. We have a cot bed but still could not do without the bumper. Hope this helps!

We have a cot bumper on DD's cot. She's 10mths old and moves all over the place during the night. She often does a full 180 degree turn and frequently gets stuck across the cot in the end corners. We have to go in and reposition her once a night on average as she cries out in her sleep when stuck. Not sure what the answer is. Am hoping that it will be over when she's too big to move around much.

Thanks for your replies. We have just returned from a couple of nights' at my mum's where DD slept in a travel cot. She didn't roll over once, and mostly stayed in one place all night. Most importantly, she only woke up once each night
My conclusion is that the bars on her normal cot are allowing her to lever herself round. I think she puts her feet between them and then pushes against them. Absence of bars = bliss (I hope. Of course this could all be a horrible coincidence designed to get my hopes up and then dash them.)
So on the way home I bought a travel cot. Still need to get a mattress for it but I'll update this once we've tried it out.