It's a bit of a swine, this stuff

Worst case scenario is a 100% wool carpet and the pollen got wet from the water in the vase. Unfortunately this is the most common scenario too! The pollen sticks to wool like the proverbial to a blanket, and the water helps the pollen get really embedded into it.
Best case scenario would probably be no water on top of it, on a nylon carpet.
I use an alcohol spotter, one that is effective on stuff like soot damage, greasy head patches on sofas, draught marks etc.
The most important thing is to dry vac it loads and loads, possibly using your extractor and hand tool if it's already been wetted, and groom the carpet with a handi-groomer whilst you're doing it.
The fact that she's already 1001'd it might be the nail in the coffin. Gut feeling...this is more likely to be an insurance job
