Am I wrong for wanting to sign my daughter's report card?

[Captain Morgan]

My daughter's mother is refusing to let me sign my daughter's report card. She says she's already signed it. I told her that's fine, I want to sign it, too. She says no, and here's her reasoning:

As for signing, there is one line for a signature. You already signed the interim report and that was before I even got to see it.

I can't tell you how important it is for the mommy to get to sign the report cards. My mom always signed them. Dad always looked them over and made comments, but mom was the one that always signed them. Everyone I know always has them signed by Mom. It's a big deal. I don't know how to explain it. Why are you so adamant about signing something that you know means so much to me? Is it because you know I want to do it so badly and you are doing it to me mean or is it so you can show the school how involved you are and you think this is your way to prove it?

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So, am I wrong for wanting to sign the card, too? Or is she just nuts?