How to ask someone about a yahrzeit?

Hi all, I’m still new to Judaism and have a question about yahrzeits. In services today (reform congregation), when rabbi announced yahrzeits, I recognized the last name of a woman at synagogue who I have become friends with (she has a rather unique last name). I wanted to ask her who the person was to her and how she was doing this week, but I didn’t know how, and I didn’t know if these kinds of questions are encouraged? It is there some kind of standard thing to say to someone who is observing a yahrzeit? I’m thinking of calling her after shabbos. Thanks.