Are dialogue tags after a question capitalized?

When writing dialogue and dialogue tags, I have always asked myself if the tag is a complete sentence. If so, I use a comma and lower case such as:

She said, "Bob."
"Bob," she said.

"She said" isn't a full sentence on its own (in this context), so I use a comma instead of a period. I know this is correct. However, when it has either an ! or a ?, such as:

"How are you doing?" she asked.

I use lower case for "she." Is this correct? Or should it be capitalized, since "How are you doing" ends with punctuation that is not a comma?

Solution 1:

Yes, everything above is correct as far as I'm concerned. But don't forget about these kinds of scenarios:

Like phrase A) "How are you doing?" she asked.

As opposed to B) "How are you doing?" She asked it like she already knew the answer.