Telling a puppy to sit isn't going to stop this behavior
You're going to have to do some behavioral training
Get someone to volunteer to come to your door
someone your pup isn't that well acquainted
and someone with A LOT of patience
Have them ring the bell
Tell the little jumping bean STAY......
and go to open the door
If she rushes the door ..... No.... and turn away for a min
Repeat until she stays for you
Then open the door a tiny bit
Again if she rushes to get to the person on the other side
Close the door...... No...... and wait a minute until she stays for you
Your volunteer might be outside for a long time
make sure they have a coat and some hot cocoa
it will take a long time