I'm on bed rest and so I'm on my PC more often than I usually am. Especially the past few weeks.
In regards to her diet, I know over a dozen Yorkies that have had developmental issues only three are related in any way, but the common denominator is that all of these dogs were raised on the Yorkie Canin Diet. I personally think there is MUCH better food out there, and by no means am I telling you to stop feeding it (I also happen to know of a few that look great on it, they just have organ issues), just wanting you to know.
And regarding Cheerio's as a treat...she doesn't receive any benefit from it, so personally I would not give them to her. Instead go on the path that you're already headed (carrots and so on) and maybe give her green beans, canned is just fine, rather than the cheerio's. It's a better "filler" substitute.
Anal glands-IF they are to be expressed by a groomer, I'd do it no more frequently than once ever 6-8 weeks. In fact, the groomer SHOULD use his/her discretion. If she hasn't shown any signs of discomfort at home and her bowl movements are normal then I wouldn't even attempt to express them at the next grooming appointment. If you don't ask the groomer to do it, then she should not do it that session is how I'd probably handle it myself.
(and scooting isn't always a sign that the anal glands need to be expressed, there are many reasons why a dog might "scoot" and this only happens to be one of the many)