Please help for baby vomiting. Thanks!!! Sorry could not type ch

From Sat night, she vomited around 9:30pm every night, total 3 nights already. she vomited Only after the feeding around 9:30pm. During day, she was fine. Normally she drinks 6 oz per time during daytime feeding. We feed her 6oz around 9:30pm and another 4 to 5 oz around midnight so she can sleep until 8am. Before the vomiting happened, she can drink 30-33oz per day. Now because of the vomit, she throw up all 9:30pm feed and we did not feed her around mid night. she cried a little bit during the night but did not wake up. But she had not pee for 8 hours until she woke up in the morning. The nurse said that she might not need that much milk at night so if she asked me starting feeding her some rice cereal around 8pm and let her sleep. I just worry that if we did not feed her at 9:30pm and midnight, she only drink 20oz per day, not enough for her age. She is almost 5months. Did you have similar experience? Is the nurse correct? appreciated any input. Thanks!