* There might be an obscure anime with that title. The anime world is vast, and there could be lesser-known titles that use this name. You might have to do some more digging to find it.
* You might be thinking of another anime with a similar name or theme. For instance, there is a manga series called "Alice in the Country of Hearts" which features a character known as "Queen of Hearts" and has a very similar style to Alice in Wonderland.
* You might be thinking of a specific character. There could be a character named "Queen of Hearts" in an anime you've watched, and you are remembering it incorrectly as the title.
To find the anime you're looking for, try the following:
* Try searching online using different keywords. For example, "anime queen of hearts" or "alice in wonderland anime."
* See if you can remember any other details about the anime. For example, what genre was it? What was the art style like?
* Ask for help on anime forums or communities. Other anime fans might be able to help you identify the anime you're looking for.
I hope this helps!