To y'all saying it's unrealistic that the MC doesn't recognise her, I have first hand experience of being in that situation. I used to stay at a friend's place in university because it would take me 2 hours 1 way to get to school while it would take me 15 mins if I stayed at his place. He has 2...
In case y'all don't understand this reference, it's from Cracked's After Hours series. I forgot which episode but I vaguely recall them saying this twice. You can check out the entire series on YouTube. It's really entertaining!