Hi. I'm Dr. Lee and will do my best to help.
Was the enlarged heart diagnosed via x-rays by your vet?
Does she have a heart murmur?
Does she have a liver condition?
Thanks for the info.
With enlarged heart, she might have a heart murmur as well. It would be best to ask your vet and see if they can prescribe you some heart medication to help the heart, such as enalapril. Aside from that, and the current medications you are giving, there is nothing more you can do at home.
Please let me know if you have any questions or concerns. Thanks.