YIKES! That'll teach me. I got my wires cross. I was writing an article on CA-MRSA when I flipped over to this window and tried to answer your question. I got going with the wrong sentence in the wrong place.
What I said about requesting IVs is still true. If orals aren't working, it's time to push for some IV abx, possibly a combination of such. The Stenotrophomonas is a particularly resistant breed of pseudo, and is the type that can preclude a person from being a candidate to use prophylactic azithromycin doses.
I'd still call the clinician and let them know your daughter is still coughing. By the time she's got a fever it will be even harder to eradicate this bug. So many times my doc would "wait and see" how much sicker I got before doing anything. Once it took MONTHS to undo all the damage my body had endured because it was ravaged by infection.
Again, apologies for the misinformation. Won't happen again.