Hi Paige-
Here is the package insert for IVERHART MAX Chewable Tablets: http://www.virbacvet.com/pdf/product_pdfs/IVERHART_MAX_Chewable_Tablets_Insert.pdf
It contains ivermectin, pyrantel pamoate, and praziquantel, so it treats heart worm as well as round, hook, and tape worms.
Sometimes products with inactive ingredients will not list them, but still list the % of inactive ingredients. So this product may not have any. You also may want to check the list of side effects to see if her reaction matches one of the listed side effects. Otherwise you might want to call Virbac and ask if there are any inactive ingredients.
