What medications is she taking? What are her medical conditions?
Give her plenty of water and cranberry juice until you can get her to the dr's, it does sound like a UTI..but you might take her to se her OB to request a pap smear to make she isnt having any female problems also.
As soon as you can get her into the doctor you should. It could be quite a few things ranging from serious to not so serious. With the tingles and the slight blood loss I would check her medications and see if any of them have a side effect of thinning the blood.
My first thought was vasovagal, but then as I read more I dont know what to say. Obviously she needs to see her doctor, but as you stated its storming, so that is not possible. Its possible the bleeding is serious or something such as hemoroids--but that would depend on where she is talking about bleeding. If I were you, with your moms age, I would call her doctor and explain you can not drive in the storm, but if its an emergency the ambulance can be called.