I have to apologise for the mysterious message "valid". This is meant to be "Player name or password not valid". On the full screen version of Chihuahua the first five words are not visible, resulting in a truncated message that seems to be saying the opposite of what it is meant to be saying. Whoops. I'll have to fix that asap.
What I suggest you try, cmh, is to click on the yellow "Reset" button, towards the bottom right of the screen, under the "Forum latest" section. Then, if Chi is signed in with your husband's player name, sign out. Then type in your player name, cmh. (Forget about the new name you registered - that hasn't been activated.) Then type in your password - don't rely on anything that might have been inserted automatically; that might be the wrong password. Then click on "Sign in".
If that doesn't work, let me know, either here in the forum or by email to support@lexigame.com. Best of luck!