You can check with you local police supply store, if there is one in your area.
There are several things she should know before carrying pepper spray though. The 1st thing is to make sure it is in fact legal in your area. 2nd is that pepper spray has a very nasty habit of affecting all parties involved, especially if spraying it into the wind or if she is an area that has little ventilation. The bad thing is, when it is time to use it these are usually not factors that you can control. If she is forced to use it in these situations, they are both likely to become incompacitated and you better hope that it wears off of her before it wears off on the other party. I may be wrong, but I believe it takes around an average of 30 minutes for the effect to wear off if the person isn't decontaminated with water immediately afterwards. Even with water, it still burns like hell for a while. 3rd is that it doesn't always effect everyone, especially the 3 d's (drunk, drugged or deranged). I have personally seen people sprayed that just look at you afterwards and aren't affected at all. I have also seen people that are only slightly affected and become extremely violent after being sprayed.
We had to certify with pepper spray before we were allowed to carry it at our department. The reason we had to be sprayed with it is so that we would actually realize that lethal force could be justified if we had to defend ourself from someone with pepper spray. As soon as we were sprayed, we had to cover our weapon to protect it and fight our way to our unit and call for help. None of this is easy when you can't see or breathe. I have been exposed to it enough now that I am a lot more immune to it than I was the first time i was sprayed. However, it is still some pretty bad stuff.
By the way, the last time I volunteered to assist with the new officers that were being OC (pepper spray) certified, they only sprayed it on the tip of a q-tip and rubbed it right above the officers eye (singular, not plural). It still affected them, but not like the full blast of the spray. Unfortunately, the 1st time they have a "real" experience with it could be a real fight for their lives.