Introducing Formula. Advice please

Alyssia • Thankful- Grateful- Blessed 🙌🏼🙏🏻 Alessandra Grace 💖 4/18/16 Leonel Jaxson 💙 1/22/20
Hello Momma's!!! 🙋🏻 my EBF days are coming to an end because I have to prepare to return to work full time come September. My plan is to continue to BF for baby girls first feed in the am then when I return from work about 5 then again before bedtime. I am going to have to supplement during the day because I just won't have the time to pump during work hours. Baby is 3m and usually eats 4-5 oz. when pumped. I started today with About 3 oz of breast milk and added 1 ounce of enfamil supplementing formula. She didn't drink the entire bottle. Maybe 2.5 oz. Is that normal? She seems fine. I'm going to mix for a few days then give her whole bottle of formula. Does this seem ok?