Without a doubt MikeFlake,
Linda needs to go her cardiologist as soon as possible. Conditions have changed and he/she needs to know what is now taking place. In my humble opinion, Linda should operate in such a way as to put "no load" on her heart what's so ever.
She really needs to be checked out. If her Doctor is unavailable, take her to the emergency room and bring all of her meds with her. They need to know the type
of prescription as well as dosage.
Hope this helps.