Sontaikle, I think the best advice is to include some higher-calorie, low-volume foods. Like one of the other posters, I remember that you like peanut butter. Well, open up that jar and go to town!

! LOL! Just kidding! But seriously, start eating real p.b. rather than pb2, have a handful of nuts as a snack (those pack a big calorie punch), put real mayo on your sandwiches, etc. There are lots of ways to increase your calories.
One thing to be careful of is getting hooked on the high of losing weight. I'm not saying that this applies to you, but it is heady at times to keep seeing that number go down, but that can lead into dangerous territory.
I'm twice your age, and I average 2200 per day (although I do weigh 20 lbs. more than you). So, definitely increase your calories.
And don't feel bad about posting a question that you may have asked before. I'm sure we've all done that.