Ok, I would pen her up, and check the udder just after she has fed them - she may still have residual lumps etc, so still painful. A few days of Metacam should help her. If the udder still feels hot, she may need another course of AB's, she may well have subclinical mastitis (I have had that quite a few times with the goats, they were antsy at milking time, lumpy udder, usually no temperature and no other outwards signs that anything was amiss)
Also if there is water available the lambs may just fill themselves up on that. I have had that in the past, but you would notice soon that the lambs are not thriving. Watch the lambs for a while during the day if you can.