"I don't understand why she likes him or when she started liking him."
or should it be
"I don't understand why does she like him or when did she start liking him."
Should I used the question form for the second sentence? I want to know if you need to use the question form if you are asking a question in a much larger sentence that is not a question itself.
I want to know if I can ask "I don't understand Why he/she did/wanted something" without question form.
"Why you did this" vs "Why did you do this"?