Just curious if there is a way (app maybe?) to send messages from your phone to a 3ds user. My daughter always has her 3ds at her grandmas house with her so it would be nice if we could over wifi send messages to one another.

Is there any sort of app out there or does the 3ds even have that capability?

There's no app for that unfortunely.

There may be a web app that's compatible with the internet browser on the 3DS. Google "Free Private Chatroom" and you may find something that'll work.

Added after 17 minutes:

Try this: http://bloochat.com/