I wish we could've gotten more with her alongside May and the other Spiders, but narratively I can see why that makes sense not to include her, because then you would have to have a much greater focus on Peter B. confronting her, and possibly how she would react to him, and that would just be another big thread the movie didn't really need to add onto. So they just relegated it to the diner scene, which allowed them to get the point across much faster and make it more comedic too.