Bless your heart Leah honey, your Emma will be just fine. Be sure to follow "doctor's orders" and keep her quiet until her treatment is over. That is VERY important! The shots she got to kill off those nasty worms can make them really sore and that's why she's a little shakey. I've had several rescue corgis that had heartworms and I have been through treatment with them so I know what you are feeling and how worried you are. Emma has the best medicine in the world though - you and your family and all the TLC she can possibly need.
I've talked with your "Gram" about Emma. You can hold my hand and lean on my shoulder anytime you need to and ask any questions you have.
Hugs to you and Emma!
Debbie