I don’t have more info. on it at the moment, but honestly I don’t think more pellets is the way to go. Since she begging food but not eating hay in huge amounts, I would play around with different types of hay. BT gives her two more variety, and they like one one day and another the next. I think if you change up the good stuff it will help her develop a taste for it and eat more. I know it’s harder to come by where you live, but does BB ship to you? She has a great selection, and if you store them well, they last for a very long time if you’re switching among several, so the initial expense wouldn’t be so bad in the long run. I love that hay keeps, unlike veggies.
If it’s just calories and pounds you want to beef up, you could give her more carrots. They are now considered very good for the buns and they can have them for their nutritional value. With not as much sugars as fruits (another way to go, btw, like apple slices) you can give them frequently and not worry.