4 oz isn't much to Max, but it would have been a lot to Grace. What does she weigh?
They often stop growing or slow down a lot 9-15 months, especially if they are crawling/walking all the time. It is hard to get enough calories in! Plus, they stop the amazing growth rate and start focusing on other things, like emotional growth, physical abilities, mental growth.
Usually between 10-11 months I say go ahead and drop a feed. She is so close, if you can get her to drink ebm at meals, she will probably be ok to go to 3. Grace dropped her feeds almost all in the 11th month and took her last nursing two days before her 1st birthday. Max is still nursing 2-4 feeds at 15 months old.