When should I send it?

So, in December 2016 my long time girlfriend went on her mission for the LDS church. Although I'm not LDS , I dated her for 4 years and we discussed marriage before her departure. We got on Rocky ground during her mission and we have stopped talking.
I know she's just on an religious high, and I don't want to lose her, and she should be home sometime in June. I have a plan to send her a letter to try to remind her I still love her and I want to be with her. I dunno why I just have felt and know it's the right thing and what I should do.
My question is when should I send the letter?
My only concern is how it looks to her if she receives it right after or even shortly after she returns...
When should I send it? I don't expect her to reply, but when would be the most impactful if she returns in June?
Now (So its waiting for her, and her parents may forward it to her)
Vote A
Send it in May ( WAITING FOR HER)
Vote B
Send it in June (As she gets home)
Vote C
Send it in July (Gives her time to decompress)
Vote D
Select age and gender to cast your vote:
GirlGuy
When should I send it?
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