Congrats on your new baby
The advice I got was to start mixing the new food in slowly with the old food in very small amounts over about a two week period of time. I started with just over a tablespoon of the new mixed in with the old then added more every other day until they had only the new food.
I wouldn't add canned until the switch to the new kibble is complete and you see how she does on it , but that's JMO. If she's not eating than I guess I would , but if she's eating I wouldn't until you see how the new food reacts with her.