I'm sorry. Ouch.
Why don't you just tell her "Dad doesn't write well, it's very difficult so I will type it for you."
Use your computer, print it out, cut it out and paste it on the next card.
Make one now so she can see what she can expect for next time since she is too young to put it all together in the future.
If you have color ink, print it in her favorite color.
Remember: some people can't write at all!
Good luck!
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"Every day is a journey, and the journey itself is home." -Basho