I wouldn't.
I think there is a huge pressure to do what we feel obligated to do. If you feel obligated to do it, then you aren't acting through yourself and doing what you want. I don't care if a girl gets mad anymore because I always keep the mindset that well if this ends it will because she is screwed up and I will replace her in 2 weeks.
So to answer your question, No. Never do anything because you feel obligated to. Always do what you want, even in something like this. If she is choosing to say this so early on, that is her choice. Do you feel the same way? Do you feel comfortable saying I love you back? Is that what you want to do? If you do it because you feel obligated it DOES cheapen it, you're absolutely right.
Not only does it cheapen it, but you are SPAM power, and lowering your own value to yourself. I've found that when I follow my true intention no matter what I always end up valuing myself. It has nothing to do with demonstarting value to others, and everything to do with how I feel.
Anyways, to make a long overly complicated post short, don't say it if you feel forced/obligated too. Say it because you mean it. I find it hard to believe she is in love, you must have some tight game
CHAT