How long has she had the heartworms and how bad are they?

Since she is older, you might try the slow method of killing them since it is less hard on the dog. The stronger methods killed off the worms quickly but this meant larger clumps of dead worms in the dog's system which can cause major problems and death of the dog.

Here is a good article worth reading that I posted on the other thread --

http://healthypets.mercola.com/sites...heartworm.aspx

You can search Google for more info on this using "heartworm treatment ivermectin" and that brings up more articles.

Good luck with her and I hope you can get her treated.