Oh dear oh dear!
Lily pollen by any chance? Wool carpet?
If either of the above is a "yes", she's probably going to have to contact her insurance company.
I've had partial success with pollen on wool in the past using the same type of products used for cleaning up after fires, leaving a long dwell and rinsing hot.
The problem is that pollen is designed to stick to the legs of insects, so it sticks to carpet fibres, especially wool, like the proverbial to the blanket. As per usual, the vase of water has gone down with the pollen, which means that the particles have migrated well into the fibres.
By all means have a go at this, but please don't put your customer under any false illusions!
The only possible alternative may be some "advanced" stain removal techniques, which would go way over her insurance excess so probably wouldn't be economically viable.
You can offer to supply a report for her insurance company if they'll accept it (a lot won't, they'll send their own appointed firm out to look).
I treat these jobs as a loss leader, try to make a rapport with the customer and help out any way I can, then mail to them for future work.