I don`t really like to say, as I`ve no medical expertise. Also, I only have one experience of nose bleeds. But my grandmother, who also had high blood pressure had a couple of very heavy nose bleeds, and was told they were an alternative to a stroke.
I really don`t know how accurate this information is, it happened years ago, and I`d hate you to take it as Gospel. But I would suggets your mum sees her GP.
My mother, who also had high blood pressure, had very severe nose bleeds that just would not stop. I used to have time to drive the 15 minutes to her house, and try to help her as she stood over the sink in the bathroom for another half hour or so until they stopped.
Even though she was on Warfarin, and you would have thought the hospital would worry, we were always told that they were not regarded as a problem until you could say the blood would fill a tissue box!!!
It was frightening for my mum, who didn't have AD, so I can imagine what its like. Eventually, the medics cauterised a recalcitrant vein in mum's nose., but they still persisted. A sad end to the story is that she was so fed up with the nose bleeds, unbeknown to us she stopped the warfarin and died a month later after a blood clot in her stomach detroyed her bowel.
Dad just phoned to say Mum's nose was bleeding again so he phoned GP who said that it was most likely to be a tear in her nostril since it was only lasting for a minute or so and she was already on high blood pressure tabs. I've to pick up a prescription for ointment today. GP seems to think it's nothing to worry about. I must say GP he spoke to is very good.