Couple of things you need to do. Feeling words work, but like others said you have to mean them. Fake words..well come out fake. Google 5 love languages. Just because how you like to show love does not mean that she will receive them well. If you really like your partner, them really get to know them..deeply. For example, I showed my love by "doing things", whether it was painting a wall, stopping by the store and picking up an item, starting her car in the morning in the morning, etc. What I failed to see was she could do this stuff herself and did not place much value on it..what she really placed value on, was the out of ordinary hand hold, when she was on her way out the door to work and say "you look amazing", buying a book from her favorite author. I had to get in-tune to how she like to be loved , what I was doing was falling on deaf ears, even though I meant it deeply. If she is an emotionally healthy person, she will do the same now or very soon.
What you want to be cautious on is being overly co-dependent. You do no want to lose who you are in pleasing her. If something bothers you, goes against you values, hurts you, or makes you feel like a doormat, then speak up. Hiding these emotions subtly makes you pull away from her, you put walls up and close her off to your true emotions. Speaking up, discussing in a calm manner of how it made you feel, not only shows of a wrong done, but shows you are a strong person, confident person. And most healthy women are very attracted to this.
Lastly, do not try and fix her. If something is wrong in her life, whatever it maybe (besides catastrophic events), be there, and tell her you understand. Do not feel sad because she is sad. Be the strong person she is looking for and not the wet blade of grass she is trying to lean up against (this actually goes for females as well). For some of us males, fixing the problem is the what we have been brought up with. If you feel the need to help..then ask her. Say, I have some ideas on this if you want to hear them. Let her make the choice instead of you making the choice for her. How do I know this? I was a fixer, and it about ruined my marriage.
Hope this helps!