I don’t think a lot of people understand how frustrating memory and concentration problems are. It’s not cute or “ditzy” or whatever to forget what you were doing or thinking about moment after you were doing it. Being able to complete a task or thought because you can’t remember or focus long enough to finish it is a terrible feeling.
I think a lot of people forget that Summer was Yangs mom too. Giving birth to a child doesn't automatically make a parent and Yang loved summer with all her heart