
Would not over do the milk but if she likes it then try half milk and half water and then reduce the milk as far as you can and still get her to take it. AB do take up to 48 hours to really get going but I expect to see an improvement in 24 if the meds proscribed and the correct ones for the infection being treated.
Milk can cause loose stools but mine love it and I had one that would only drink at shows if I dribbled some milk into it.