Ellen

'Don't get all her up about it again
means
Don't get her upset about this matter again.

But it's all blown over now
means
But it's all over now.
or
Don't worry about it. It's been forgotten.

blown over" is not commonly used. Did you mean "blown up"?

"Blown over" is very common indeed in both American and UK (British and British Commonwealth) English, Punkey. It is used to describe a situation where a disagreement or argument or shared anxiety or troublesome situation has finished. Example:

Mary was angry with her husband Bill last week because he came home drunk, but it has all blown over now.

I would advise you to think and check before you make sweeping statements like that, but plenty of people have already done so, and you never take any notice.

You wrote this wrongly. "het", not "her".

"Don't get all het up about it" means don't get upset.

"It's all blown over now" is a metaphor for a storm. The storm has passed, all is calm.

"Het" is probably an old form of "heated", but I haven't checked this.

okay?

Most of this is spoken English so it is difficult for new speakers of English.

it writes ' blown over' on the text~

thank you for your answer~

i checked the context. it is 'her'......

i agree, spoken English is more difficult than written English, it is easy to make non English speakers confused...

If that is the case the original is incorrect. Perhaps it's a typographical error.

The sentence "dont get all het up about it" is quite well known and makes sense within the context you have posted.
It means to me dont get angry and/or upset

The phrase "It's all blown over" is even more common.
This means what has happened is in the past and forgotten like when a storm has passed.

I believe "Het" is an obsolete/dialect version of "heated". These old fashioned versions of words often survive in sayings such as this even though they have fallen out of use elsewhere. E.g. "There's many a slip 'twixt (betwixt, means between) cup and lip"

Did you perhaps transpose the word 'all', Ellen?

Don't get [all] her all up about it again.

It makes sense with 'all' moved to after 'her'.

"blown up" would have meant the situation had gotten worse, exacerbated. When someone blows up over something, they are really mad.

Blown up, as in a bomb blowing up.
Blown over, as in a storm that is over.