You may want to syringe her a bit more, an adult cat needs between 5.5 and 6.0 ounces of food to maintain their body weight, although tiny cats like my Shelbee don't eat anywhere near that much (Shelbee weights about 7 pounds).
You may want to stick with the 100ccs of food, because if you mix the food with water to thin it out (I'm speaking about AD here), a can works out to be around 200 or so ccs. So even if you are giving her around 100 it is only about half of what she needs. Since she isn't feeling well from the URI you don't want her to get weaker from not getting enough calories and make it that much harder to bounce back once the URI starts clearing up.
I think waiting on the ultrasound is also a good idea, give her time to recoup from all that has been going on in the last couple of weeks.
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