Update! Daisy had a cystocentisis and urinalysis and no crystals!!
We're waiting for the rest of the results, pH and so forth - hopefully we'll get them in the next day or so (this vet is open over the weekend).
Fitzy - his bladder was empty.
I'm going to take him in for another try next week - first thing in the morning. The only time they were able to get urine from him in the past was when I took him out of our bed and directly to the vet in the morning.
So we're on pins and needles waiting to hear about Daisy's pH - fingers crossed.
But no crystals is fantastic - I feel really good about that.