Welcome....Yes, there are a few reasons for this: Panting is a sign of pain!!!!......Vomiting & NOT able to poop signals an Intestinal Blockage.....Has she eaten anything unusual like a toy, ball, sticks, socks, etc?
Also, this could be a Stomach Bloat/Torsion.....Bloat is FATAL quickly! Blockage is also fatal, but not as fast......
You must seek medical attention for her Immediately......IMO, You have an emergency setting up......
Please, let us know how it turns out & good luck..