I agree with the other poster.
I would suggest asking for it as special cleaning and then specify what sorts of things you need.
If you uses a term like "Hypoallergenic", there is a lot of room for different interpretations. You are much more likely to get what she needs if you can tell them very specifically.
You can try calling Special Reservations - the number is posted in the disABILITIES FAQs thread in the post about rooms.