I've gone from cosleeping to cot twice this year! First time at about 6 months but I ended up taking her back into my bed during the 8-10 month sleep regression when she just would not settle at all.
Then at 11 months I had to get her back into the cot again because cosleeping was not working for either of us! I have a cut off at 5am - if she wakes from then I take her to my bed because otherwise she'll just wake for the day.
At 6 months I rocked her to sleep at the beginning of the night and put her in the cot - when she woke I'd do the same again and again. Although I had to put her back in the cot loads and loads at first, after a few nights it dramatically reduced. This time, she is too heavy to rock, so I put her into the cot drowsy and wait for her to fall asleep herself. If she gets upset I pick her up and repeat the process. (This is basically the pick up put down method).
Both times I had to sort of psychologically gear myself up for it, because I had to put her in the cot many, many many times (!) and sleep is initially worse. For example this time, first night she woke after a couple hrs, got her back in to cot but she woke after 10 mins - did the same 5 times!! But I'd say by the end of the first week it's dramatically better. Now she is only waking twice all night which is soooo much better than 7+ wakings when cosleeping.
So I'd recommend just trying putting her back in again and again, even after 30 mins, try and persevere and it might get better more quickly than you think. Just be prepared for say, 3 nights very very poor sleep!!