Although I am BF'ing DD2 is on Losec (compunded version) eqivalent of an adult dosage (20mg) and also on Gaviscon which is a thickener, I do find that the combo does make a big difference.
If you do mix it with the milk, can you give her just a small amount of milk with the Losec in it first, mix it in a small medicine cup with some premixed formula (jsut some directly from the bottle), perhaps try using a neurofen syringe to administer it, because you can get 5ml in it and it seems to be successful with quite a few people I know (as well as us), that way you know she is getting the full dosage and then the rest of her formula with the thickener in it.
Oh and if you ever need to give her pain meds don't give her Neurofen, just Panadol, unless you really have to because Neurofen plays havoc with DD2's reflux.
When DS1 had it I would just syring into his mouth into his cheek or down his throat, it is not the best tasting thing and he fought with me the whole time he was on it 5 weeks till 7 and 1/2 months.
I did get our 2nd and bottles after flavoured, the pharmacist looked into what he could mix with it he was restricted with what he could add due the PH of things but in the end added cocanut and pineapple and it tasted slightly better. (baby pina colada LOL)
Its hard and upsetting to get them to take it but it does help them
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