I'm trying to see how feasible an idea I came up with recently is and I'd love some input from others who have done something similar.
I support my girlfriend financially. She lives in an Asian country where I used to live (and to where I'll retire in 6 years). She's 52 and is full-time caregiver for her 5 y.o. grandson (not my grandson by blood, but I definitely consider him mine now). I recently had the idea of making her an authorized user on a credit card, which she would use to make everyday purchases (and which I would pay off, reducing the cash I send her monthly via Transferwise accordingly). I live in the US.
Note that I'm not looking for any comments about how "unwise" someone thinks it is for me to do this, opinions on whether or not she's trustworthy or not, etc. I know she is; over the 12 years I've known her she's shown herself to be very responsible with money. I thought this would be a great opportunity for her to learn about a type of spending she's not used to (she's had a debit card for years, but never a credit card), to not have to worry about having cash on hand so much, plus of course I'll earn points on her spending 
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After a bit of research, it seems to me that a good choice for a card is Citi ThankYou Premier. They have a 60,000 SUB right now on three months of 4k spend, which I can easily plow through myself on my next trip to visit her 3 months from now...that's also when I would deliver her AU card to her (as retirement is looming, I only visit once every two years now). The reason I'm thinking about the TYP (I don't have it yet) is that it's a Visa (I myself am partial to Amex, and while there are plenty of places she could use one, there are also many she wouldn't be able to), it has a decent SUB, and from what I've read online, they don't require authorized users to have SSNs. Of course, it also has no foreign transaction fee.
So my main question is, would this be something problematic to do with Citi? I have heard of people doing this before, for a relative abroad, etc. I assume I would need to file a very long-term "travel alert" with Citi (a year at a time?), and that until they got used to charges coming regularly from overseas on the card, I expect there would probably be a few denied purchases, etc. that I'd have to deal with. As I said, I trust her to spend responsibly, but nevertheless I would also carefully monitor the card, and set alerts to come in on my phone with every purchase she makes (something I do for my own cards as well). So I'm not really worried about safety...but do you think Citi would be unecessarily so? If so, is there another card issuer that would possibly be less freaked out about it all (one which does not require an SSN for an AU)? BTW, Chase is out, due both to my currently being over 5/24 and also due to their overall finicky nature (though I do bank with them).
Anyway, any stories of others' experience with similar setups and DP-related (not conjecture-related, please) pointers on this whole idea and whether or not it's feasible would be greatly appreciated. Thanks!
