Take the hint, then! stalker alert
And only 863 of them have been unsolicited dick pics
Maybe I'm wrong but it is "to send sth to sb" as it is described here :
So why " I have sent to her" is not accepted.
You could say "I have sent a thousand messages to her," but not "I have sent to her a thousand messages." If you put the indirect object first, no preposition.
I know it's inconsistent, but inconsistency is what English does best.
She doesn't answer