Let me re-phrase, as much the breed of the buck compared to this doe. Say a young ND doe and a large Boer, you would not plan for a FF, especially a young one. They are just far different body type & size.
I would get a good vit/min and start there. Some of the loose cattle ones are good, SBC listed one she likes in another post, Southern states product I believe (at least sold there). Since they are 50 miles from me, I found one very close in ingredient @ TSC. It's a loose product. My girls like it & I feel it is better than the one I was using as it does have cobalt, that other did not. There is a good amount of copper in it. 50# and I THINK it was about $30-35. Been a couple months...not positive of price but close. It is not weatherized as one she uses but, my feeder is inside, so ok.
You can't just dump but so much change on her at once but, the vit/min free choice she will use well. Have plenty of water out!
Her age will play a role in her status and this situation, as well as her general health. Obviously. These things happen and sometimes all we can do is the "best" we can do, which I can tell you are trying to do. After all, you didn't have her when this began.
SBC hasn't seemed to be on as much of late...that time of year. She will have some excellent input when she's available to reply. More technical than I