I've read the recommended dosage is 5mg/2.2 lbs. I think it was on a post by @casportpony , unless I'm mistaken. Crush It up and mix It with food or water.
That sounds more accurate and the direct dosage would be best for making sure she gets it in the right quantity. But it would be hard for a layperson to find or measure out 10-20 mg when the pills come in 80mg. (I’m remembering trying to 1/4 my cats tiny little heart pills with any degree of accuracy for her dosage even with a pill cutter!)