I also checked on the pellets I have been giving her, they are Merit active supplement pellets. Hope this helps...
Yes that does help. I googled that and got this site. Here is the specific feed site. Is this correct? http://www.lakecountryfeed.com/m_active_pellet.asp?ID=
That does sound like a good option. Hopefully someone with experience with this feed can chime in. I always prefer more hay over less + supplementing, but this feed would be good in addition to all the hay your horse can eat. ;) Once up to a good weight then I'd do some tweaking to stay at that weight.