Yes there is a link. UTI's and Bladder infections are pretty common in PCOSers.
Here are some ways to avoid it.
Avoid using any powders, perfumes, (even those "designed" for vaginal use) or colored/perfumed toilet paper in the vaginal region. These all can change her PH balance that is natural to her.
Do not douche often. When you insert the douch neck, you can actually be pulling something into the canal. If you must douche, make sure its plain water (no vinegar -empty old contents and fill with plain water) and that its a rarity.
Wear breathable undies
Urinate often. During urinating, do exercises (starting and stopping the stream until nothing left)
Wipe front to back. When suffering diarrhea or if there is a "splash up" from the toilet, make sure she washes her vaginal area before getting redressed. She can buy "gental" babywipes to do this (have her drain out as much as the soap content as possible and put back in 1/4 cup PLAIN water)
Bathing is fine, but she should wash the anal and vaginal areas before getting into the tub. She can do this by sitting on the toilet and using the babywipes.
These are all things that were instructed to me by my Gyna. I have had a SIGNIFICANT amount less of infections then before I took these precautions.
Here are some links as well to help you:
http://obgyn.uihc.uiowa.edu/Patinfo/Adhealth/UTI.HTM
http://health.netezshop.com/articles...formation.html