She keeps getting out of her sleeping bag
Let's deal with this. Are you using the types of sleeping bag with poppers onnthe shoulders still? These aren't appropriate for toddlers - most can get out of them.
You want the "zip up the middle" type of sleeping bag. They have no poppers and are put on like a cardigan.
On from that, allow me to bore you with the finer details that the voice of experience has taught me. Look at the way the zip goes. Some zip up from the bottom upwards - these are easier for an older toddler to undo because it's the same skill as unzipping a coat.
No, you want one that zips up from the top downwards, so the closed zipper is at the bottom of the sleeping bag (and ususlky enclosed in a good of material). Harder for escape artists to master.
If you have one who can master the top-down centre zip, put the sleeping bag on backwards.
When I go into her she pretty much shuts up straight away and goes back to sleep
This suggests separation anxiety. IE she just feels a bit nervous when awake on her own and wants the reassurance of knowing you are there and she isn't alone.
Not being able to get out of te flerping bag may help. If not, if just ride it through. Go on, make reassuring noises and wait until settled and back to sleep then leave.
Gradually, over several days/weeks reduce the amount of reassurance she needs. Say start standing by her cot. Then at end of cot, by the door until you are able to just go in, reassure and leave. Hopefully as all this is happening she will stop waking up so often anyway.