Extra sleepy after food

We have started weaning one small meal (around a tablespoon full) at lunchtime. It’s going well but I have notice her taking really long naps after. Today she went to sleep in her cot around one woke up at 2:30. We came downstairs she was still grumpy so we had a cuddle and she feel right back to sleep and is still sleeping now 3:40. It has been a busy couple of weeks for her as well with Christmas. I just worry I won’t be able to fit in all the milk before bed time.