I'd take the water away and if she wasn't bloated after eating but was a few hours later I can only imagine she's eating straw? When their eating roughage and drinking milk it can ferment and produce gas, which is why she's bloating. Its very dangerous and can kill them. I'd take away the straw and water and feed only milk.
Milk should go into the first stomach, the abomasum, while other feedstuffs - creep, hay, grass and other forage - are digested in the rumen, the large fermentation vat.
The rumen develops over the first 8 weeks of the lamb's life, so in lambs being still bottle fed, is develop
ing, not yet fully developed.
If milk gets into the rumen, it can cause problems. Milk gets into the rumen if the lamb is overfed milk, and the abomasum overflows, or if the lamb was not introduced to the bottle correctly and does not have the oesophageal reflex, whereby the groove in the oesophagous that directs the milk into the abomasum closes as the lamb begins to suckle.
JayKay wrote an excellent post on bloat and its possible causes, which I link to at least once a year!
linky