has & does have

'She has' is a normal form
'She does have' is used to emphasise the meaning.

may you please explain some more? For example, can we say that "she does have" means she really has?

For example, If you think the person you talk to doesn't believe you, you can say ' She does have a car' instead of ' She has a car'.

Could you please explain some more? For example, can we say that "she does have" means she really has?

The emphatic "do/does" is not used very often. Here is a conversation:

A: I heard that Joyce got her hair cut. Her beautiful hair was so long that it reached her waist.
B: Look across the street. There she is!
(A sees her, and her hair is very short. )

She has a bicycle.
No, I said she does have a bicycle.
I know she doesn't have a car to get to work, but she does have a bicycle.

Blue JayI know she doesn't have a car to get to work, but she does have a bicycle.

Yes, the contrast between doesn't have and does have is fairly common.

A: May I have some jasmine tea?
B: We don't have any jasmine tea, but we do have some very fine Earl Grey.

You expanded the topic while my issue was just about she/he does have not anything more.
The thing I got from the comments (especially from the beginnings) is this:
We use she does have something when we want to emphasis that she has that thing.

khoshtipWe use she does have something when we want to emphasis that she has that thing.

Absolutely.
We were not trying to expand the topic, we were merely giving examples of how the "does" form is used for emphasis and to contrast what she does have with what she doesn't. Sorry if we were unclear.

You are very welcome & thank you all very much for your helps.