I would not hesitate to give her the milk. Especially if she slept until 7:30 !!!! Riley does not officially have night feeds, but there are occasions he will wake and have a little drink of water. I will sometimes give him milk if he has not a had a great eating day due to teething or whatever. I myself usually wake and have a drink sometimes during the night, so I think sometimes he does get thirsty. If he was waking everynight, multiple times, and wanting milk, then I would consider it a problem.
Especially after being sick I would feel glad she is taking some. And I would extra glad about the sleeping until 7:30 part!