Most Helpful Girl
... It's been over a year since we broke up...
If she has contacted you in a month of Mondays, I am sure like yourself, who has supposedly moved on, she may not be feeling the same way as you do here, dear.
Why fix what isn't broken or has been 'Fixed' when Was... Broken with this Break up. Sure, you could go ahead and push a button on your end to text a mere "I miss you," but if she doesn't reply or does push a button on her own end to tell you "I'm fine, I have a new boyfriend" or something to this Effect, it will, in fact, "Affect" you and your mended heart and here begins a whole new beguine of another sore spot in your softie spot.
It's your choice, your call, but if you do decide to take the plunge, just send a "Hi" and don't tell her you miss her. Go light and semi sweet at first until you see where she is right now so that you would not have done this, going feet first into the murky waters.
Good luck. xx0