Hi Allyson
Don't worry - you won't be doing this forever

These wakings because of developmental milestones are very common. When your DD is waking up and she has moved from where she was she IS getting a fright and she does need your help at this stage to settle back down to sleep. It sounds like you are handling it brilliantly by laying her back down and using the blankets to keep her immobile. Very shortly she will get used to her new skills and won't be so keen to practice them during the night - and the night wakings will probably stop again (until the next skill comes along

Re the milk issue - if your DD is hungry when she wakes up (because she hasn't fed well during the day) she will be more difficult to resettle, meaning you will have to offer her milk, and a habit will be created. SO I would try your best to get more milk in during the day (often at this age you need to feed in a darkened quiet room where there are no distractions) to prevent hunger also being an issue in the night.
But because your LO only woke once last night, it sounds like she is probably coming to the end of these wakings.
Well done on the way you have handled them and good luck to you.