Funny that you mention this. I was on vacation and had my dad check up on my operation once a day just to make sure my place wasn't burning to the ground. He is an old stoner thats been smokin since the 60s.
I had a small screen window over a tupperware container for watering my smaller plants, and he saw a couple larger leaves in the water, so he dried them out in the microwave to smoke them........ This is a guy that used to smoke joint after joint of Acapulco Gold while he helped a good friend trim the buds, and he was always given his own personal stash.
I cant for the life of me figure out why old people are so naive sometimes. To this day he still thinks the large fan leaves contain enough THC (actually he doesnt even know what THC is or means haha) to get you high. i guess "high" is really just a state of mind that you can obviously fool yourself into.
So in closing, smoking any plant matter, or any matter at all really, is bad for your lungs. If you are concerned about your mom's health, buy her a vaporizer. I would say that smoking leaves and pollen sacs is probably not any more harmful than smoking buds, just feels harsher and tastes like ass.
If you really want to get her to stop, tell her that the more leaves she smokes the less high she will get when she smokes bud. Its a big fat lie, but it may solve your problem and no harm done. I dont know if it's legal to grow where you are, but if its not, having another plant around (whether male or female) that you dont need is NEVER good. How pissed would you be if you got busted and they counted the whole male plant & root ball as X amount of "marijuana". The system is fucked, good luck with yo crazy ass Mom!!
Peace
KB