With tariffs hitting and virtually all non boutique/custom ($$$) bikes manufactured in Asia as well as the components, I'd go used.
A rigid (no suspension) mountain bike often makes a great commuter. You may even consider a single speed for the sake of simplicity and maintenance. The only downside there would be if she has significant hills on her commute, but the only maintenance on a single speed is oiling the chain every so often.
A Surly Karate Monkey is perfect for this, but that's a steel bike manufactured in the US so it comes in at $1700 new which may be out of your price point. Look around for a used one.
A step down would be a Salsa Rangefinder for $1000 new -could also look used.
Whatever you get, invest in a high quality lock.