How much longer does she have to go?
I wouldn't introduce completely new feed stuffs right now, but maybe divide her meals into smaller portions and feed more often if you can. Lots of greenery (cabbages, carrots, bananas, apples). Can you buy readigrass - they love it and it is more nutritious than hay right now. A coupe of handfuls as "dessert" are often appreciated..
I would have some of the following ready.:
20CMD Calciject 6 plus a 50ml syringe with a THICK needle. If she becomes staggery and not very keen to move about - hypocalcaemia (as in she runs low in calcium as she will be making an udder) - it needs injection of between 50 to 80 ml under the skin over her ribcage. Warm the Calciject up by leaving the bottle in hot water for a few minutes before you inject. It is a painful injection for them and it helps to have on person holding the goat. If you haven't done this before - call the vet out. They may actually do an intravenous injection which works much better. She may be absolutely ok, but defo one to watch out for and if not treated quickly she will not make it!
If she stops eating her food, or even just becomes very fussy she is starting to go into pregnancy toxaemia (google the condition). Get either some Ketosaid from the merchants or Cetophyton from the vet - and drench her with that at the sheep dose rate. Again a fatal condition if not treated quickly. If in doubt - drench her, it does not do any harm, it just provides energy.
Often hypocalcaemia and preg tox go together, one or two shots of calciject should stop the hypocalcaemia, but you may have to continue the preg tox drenching until she kids.
Other than that exercise - take her for gentle walks around the yard, lots of TLC.