sounds good, lets just hope she picks up.
as for food, i had to syringe feed a sow of mine last year who had dental problems.. and its hard to try and think of things they will eat so ive tried every concoction under the sun! lol
the best i found to syringe were:
veggies blended, if you have a food processor use that and just blend them all down you may need a bit of water top help them blend to a really smooth paste so it doesnt get stuck in your syringe. if you dont like i didnt, i used to boil up the veg until soft then blend it with a hand mixer and she liked that, you can also use some of the juice from the veg to mix with pellets
there is a baby food called Ella's Kitchen, they stock it in tesco its a little pouch of food for 75p or there abouts, brightly coloured packets and its pure fruit/veg puree and its organic, i always have a pouch of this in my cupboard for emergencies
i think there is a brocolli and pea one, and an apple and bannana one that guineas can have.. just check what fruit/veg are in them first.
i aslo made porridge for mine, just rolled oats and some hot water, pop into microwave (or about 30 secs when its thickened up let it cool until its cool enough for them to eat (back of your little finger is a good indication to whether its too hot! lol) and if they like oats thats good, also dried oats if you can get her to eat them, they are good at helping gaining weight just incase she stops eating.
and there is also a pellet food called cavy performance, which is for ill/pregnant guinea pigs and is packed with calories, which is great if she isnt eating and needs help to maintain her weight you can syringe them into her
and not forgetting critical care, this is a must have if your piggy doesnt eat you can buy it from thistle cavies or sph supplies, quite expensive but deffo worth having some in.
good luck, and keep us updated!
i think thats all of what i used