Think of it this way - how many husbands leave their wives or partners because they don’t get any action? Either way, too much or too little, you have to communicate about sex.
If you don’t, one of you will walk away from the relationship at some point. One year in to the relationship could, by many people, be said to still be the ‘honeymoon’ period, where everything is exciting and her over-eagerness could be excused (if that’s how you feel) but try really hard to take her addiction to you as a compliment - even if it’s sometimes unwanted and you find it a chore.
Then, look at how you could try to subtly turn it in to a more loving, less lusting relationship, and consider this - maybe she thinks she’s giving you what you want.
Maybe she thinks that in order to keep your interest, she needs to be full on and throwing herself at you. It probably comes from some experience or something she’s read, heard, seen - that men like to have sex all the time. She probably just wants to please you.
Subtle hints probably won’t work but actions can speak louder than words. You don’t have to submit or succumb to her desires - be strong and just every so often, refuse.
If she reacts badly, don’t come out with all of your feelings about it, and say nothing that will make her embarrassed - but just let her know that you sometimes feel you can’t keep up with her, even though you are mad about her. If you are.