I mild case of hunger is probably why she is stirring in the night but not during naps.
There is one school of thought that says if you feed when she stirs rather than putting the dummy back in, she'll settle and sleep more deeply. But there is the other school of thought that if you ride through this dummy-reinsertion phase you can use the dummy to teach baby to go through the night without a feed, which is better in the long run.
There's no black and white. You could be willing to feed straight away sometimes when you really want a good nights sleep, but go for dummy reinsertion other times since she is clearly not "that" hungry because if she was she's be crying rather than just stirring.
I used to have a half hour rule. If baby stirred I'd reinsert dummy. If baby stirred again within half an hour I'd feed. If not, next time she stirred I'd reinsert dummy again.
Great way to night wean. Plus it really wont be long until baby can reinsert own dummy (8-9 months old, ish) or won't wake from slight hunger anyway. So this is just a phase that will pass.
In the mean time, why are you actually having to get up? I had baby's cot right next to my bed and just needed to lean an arm over to reinsert dummy, often without even opening my eyes, certainly without sitting up. It's about making life as easy as possible.