Most Helpful Girl
You could go that route and maybe she feels the same... or you could simply text "thinking of you" or "you're on my mind" "and I wanted to say hello" "just wondering how you're doing"...
Most Helpful Guy
Don't text her man... I'd be embarrassed for you if you sent a "I miss you" text.
I don't know what you mean by hearing her "randomly once a month". Does she contact you, or are you stalking her?
I'm guessing you're stalking her.
It's been a year, that should be enough to know what to do.