Purse? Portable? Topic?
I don't think she's interesting in carrying around a coffee grinder. Just my opinion of course.
That's why you grind before hand. Does it say specifically anywhere here that she must keep her grinder on her at all times? The OP asked how we all grind, I simply added my two cents. No big deal. It was both on-topic and relevant to a direct question the poster asked. She said nothing about keeping said grinder on her at all times, because she didn't have to. She DID specifically say stealth was an issue before, so you're gonna want a nice fine grind before you leave the house. And obviously no one being stealthy whips out some bud, a hand grinder, begins making their pile, packing a vape, etc. lol. All this is going to be done before you leave the house more often then not.
See my point?
I use a grinder for portable because it's easier and better. Two or three quick seconds and it's in perfect condition to vape iin my Puffit. I mean obviously if you're looking for a fresh grind and must immediately vape after grinding, then yes I suppose a coffee grinder would be a silly choice. But it's just as silly to be fumbling with a hand grinder if you're trying to be slick about things.