Hi at the moment my rescue girl Teasel is quite skinny

So she is currently on 3 meals a day, I had a look at the sack of food and it advises about 5 to 6, 1/2 pint beakers worth a day.
She is currently on something called museli moist, which my lurchers are on, and she seems to really like it, so she is currently having 3 meals a day of 2 mugs worth
It is sticky and syrupy and does not need soaking before feeding altho i normally just add a tiny splash of water to soften any really hard bits up
Having not had a Deerhound before, i just wanted to see if i was on the right track with this, I have done a lot of reading up but sometimes i think you just end up going around in circles
Oh and i got her a raised feeder today as this morning i but a waterbowl on a bench for her in the garden and she seemed much happier drinking at that height and seems to eat a little slower at that height too
Sorry for all the waffle, any advice appreciated
Claire x