We had our cot with the side off (and strapped to our bed) for co-sleeping for quite some time. Similar to in this guide.
Sidecar cot Maybe start there and see if she'd be happy in her own space?
We've gotten to the point where she starts the night in her own cot, the side is back on her cot, it's up against the bed and when mine wakes she gets pulled into bed with me until morning. Soon I hope to push the cot away and come Spring I'm hoping to have her in her own room. Maybe.
Edited by Bky