Well, she would want the feelings to simmer first like let it settle in that Sakura's gone from his life. And then snatch him. She doesn't want to look too eager to get him.
Ehhh. Why bother, seems like additional stress for Shinobu. What's more it makes Fumi and Shinobu petty. Let his dirty laundry be aired out by other people.
Before we get any scenes from her I do hope for more Fumi screentime or better yet it's just her in for the entire chapter as a palette cleanser for everything that happened.