Tough call . . . if you're in a period of sleep training, then the pattern is very important and I would wake to preserve the feed. Just in general, and especially with such a young LO, I'd tend to be more flexible, remembering that it's a routine not a schedule.
I'd probably let her sleep until 1.5 hours as that's a nice full nap, then wake her to feed. The competing tension is that on one hand you don't want an overly tired baby, but, on the other hand, you want to get in your day time feeds in a timely manner so that she's not waking at night for feeds. I tend to prioritize keeping baby from getting OT over feed timing personally, in part because my babies tended to cluster feed intensely in the evening, so they seemed to get enough calories that way.