Is it possible to leave lo on a bit longer during the day? Ensuring that she receives all her calories during the day? Also, by spreading out feeds a little more, they take in more and learn to go longer between feeds. But as your baby is only 3 months, she may not be ready for a 4 hr EASY, but she should be getting close. You may want to start transitioning to a 3.5 hr easy or slowly adjusting her.
Just a thought.
Good luck,
Jodie