Why is it safer for her to sleep in her cot rather than with you? Bed not big enough and one of you might fall out? :D Is the cot too structurally unsound to sidecar? If you're just worried she'll fall out because she's crawling well middle child only did that once (she was my insanely early crawler at freaking 6 months wtf, the boys had the decency to be 8-9 months old before they thougth about starting that silliness) and after that came down feet first.

I co-slept with all of mine (in the same bed) from birth. When it was just two and in our old house, oldest slept in a side-carred cot and youngest in between us, when we moved and it was three, JJ co-slept with eldest in another room til eldest was 8 as I had the younger two in the bed with me (we'd gotten rid of the cot by that stage as it had proven to be extraneous). When middle child was ready to sleep in her own room (which she chose to do so at 6) poor youngest (only 4 at the time!) was kicked out by JJ to join his brother in the boys' room and there they remained til our first house flippening so poor beleagured eldest could have his own room XD

Yay for crawlinating :D