If she's well in herself then I would say it's the sleep regression. It can start anytime and it may have started the day of her jabs. Have you tried settling her without getting her out ? My sons currently going through it and is up nearly every hour. I can manage to get him to settle without getting him out as he's also terrible at transferring back to his cot. I have also resorted to cosleeping from around 4am if I have got no sleep. I follow the safe sleep guidelines for cosleeping x
It could be the jabs, tne 16 week ones were our toughest of the 3 but still not awful. But it also could be the 4 month regression too! Do what you need to for everyone to get as much sleep as possible, if it means a feed, cuddle, movement, doing something else then coming back when everyone is calmer then so be it 💜 xx