Any suggestions?

So, something you'll see about Alee when you see her pics is she has definitely been overfed. I've been calling her Ms. Pluffy Butt. I have no idea what she's been eating up to now, but she gets hay (Timothy or Bermuda, I think) and sweet feed with corn at the barn. I know she'll lose some of the poundage just from working a lot more often, but is there anything else I can / should do, her being pregnant and all? Supposedly she's not due until July, but I have to confirm that with a vet.

All suggestions welcome!