First of all this is several years old.
Secondly, opening the window and circulating the air with a fan wouldn't dilute it enough? I've never smoked heroin or been around someone smoking heroin, but I know with vaporizing marijuana and smoking crack that you can easily circulate the air and you wouldn't know anyone had done anything much less get an effect from it.
Additionally, I don't see how you would feel crappy from this. Wouldn't the effects be a minimalized version of what would be happening if you were to smoke it? I can't even imagine it effecting you that much unless you were in the same room as her. What is it making you feel like?
Finally, if you want the situation to improve I really don't think calling the police is going to be beneficial for you or for your family. It's going to cause a lot of friction within your family, you guys will have legal and financial issues to deal with, it could cause your mother to use even more, and you could be liable for anything that you might have. So if you had some pot in your room and you called the police to search your house because of suspected heroin, then they'll search your house. They won't just go in the rooms that you let them in. If they're in, they're in.
If they find something they can potentially take away your whole house. Look up "asset forfeiture".