Of course it can, multiple times, at any age.

So can romance scams, so it doesn't automatically mean every proposal is good!

If she knows the person in person, they've know each other for a long time (imho two years is when people start knowing if it's love or infatuation/lust), and they love her and she loves them back and she wants to marry them (and imo if they've tried to lived together for a while to know their lifestyls are compatible), and it's not just based on fear of being alone; it's all good. As it is at every age.

But she's also an adult and knows her heart better than you or I, so she can decide for herself what's good.