Hello,
Thank you for your query at DoctorSpring.com.
Considering her age is 27, it is unlikely that she has any major cardiac ailment to be worried about. It is not impossible though.
The best test to get done right now is an ecg. After pain subsides she could be subjected to a treadmill test. Is she hypertensive? Has her BP been checked recently? If so, what are the values?
Does she have a chest infection? Is there any fever? When exactly did this symptom start?
How has her appetite been recently? Any change in dietary pattern?
Such symptoms could also be related to GERD, where there will be some associated reflux symptoms. It mimics a heart attack pain and can also lead to slight breathing problem.
Kindly answer the questions, and I will get back to you.
Regards.