Yes! It is VERY possible that stress contibuted to your cats anxiety. In addition, many cats (and people) have harmless murmurs and live a completely normal life with them.
Before you run to a cardiologist - I suggest you have a mobile veterinarian evaluate your cat. She will not be under stress at that time because she will be in her own home. It is difficult for a DVM to grade a heart murmur without an EKG and your veterinarian may not have that eqipment.
Since she is 6 and a half and shows no signs of ilness, it is very possible she can live a purrfectly normal life dispite this issue.
Please let me know if you have any more questions. I will be more than happy to help in any way possible.
Very sincerely,
Terri
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri