Is 1,400-1,500 calories enough for a teenager to maintain on?

I lost 20 pounds on 1,200-1,500 calories and now I want to maintain my weight.  I'm 17, 5'9, and 130 pounds.  I'm not what you'd consider active because I'm a home schooled student and during the day I'm sitting down a lot doing my work.  I do move around several times a day to cook a meal, clean up my room, and stuff like that...just the normal daily activities.  Then in the evenings I'll do a half hour of either strength training or cardio...I alternate between the two.  I do this 4-6 times a week usually.  So I guess I'm lightly active maybe?  My mom says that I need to eat more because she says I look like I'm getting thinner but I'm worried if I increase my calories that I'll gain weight.  So, is what I'm eating (1,400-1,500 calories) enough or should I increase it and if I do will my weight go up?

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