Hi Teagan! I am a preschool-primary school teacher. I think Lilly is fine. I would bet any money on it that she is feeling a little jealous of her baby brother, and the best way to get your attention and hold onto it is to not talk, so you spend more time with her. When a new sibling comes into the family it takes a while for all family members to adjust! especially for the other sisters or brothers, as they were the only ones for a while. I know it is hard, but try to remain calm and relaxed, give her least amount of attention in regards to fussing over her talking. Use short words with her, and i bet she will come around, give her a couple of months. Oh by the way try extending her vocab by asking open ended questions eg: what do you like about the little basket instead of do you like the basket. This encourages them to use more words rather than yes or no. Good luck!