Brief Answer:
See the description

Detailed Answer:
hello,
If possible, try to upload ecg and other reports available. Also, let me know the troponin report which is a kit test.
Here, the primary problem looks like a palpitations and high heart rate which can secondarily lead to chest pain or heaviness etc. Also, heart attack can also cause chest pain, heaviness and palpitations, but jumping of heart rate is less common. I guess she is having symptoms intermittently and she is fine in between.
Here, the priority is to rule in or rule out heart attack. If it's a heart attack then she should be shifted to other hospital on priority. So we need two things here, one is ecg and other is troponin. If troponin test is positive then it suggest she has heart attack. So please get back with ecg and report. Or at least discuss with doctors over there, are there any changes like heart attack in ecg and about troponin.
If it's not a heart attack then the possibility is of arrhythmia mostly atrial fibrillation, which is not life threatening and certainly can wait three to four days. Ecg will clear the diagnosis. Also, if she is cardiac monitor attached, try to take picture of the rhythm on the monitor especially during high rate. It's a possiblity that she is having intermittent atrial fibrillation, during which heart rate races intermittently and become normal in between. So it's important to have ecg during that high heart rate period.
Considering, she is having intermittent symptoms like palpitations and also heaviness in chest is also intermittent associated with racing, arrhythmia possibility is more. In this case, she should be started on medicine called as beta blockers like metoprolol which will control her racing and other symptoms. Still I would like to review the reports. Get back if you have further doubts.

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Brief Answer:
It's a atrial fibrillation, not a heart attack

Detailed Answer:
This is a paroxysmal atrial fibrillation, in which heart rate suddenly goes up. Blood pressure falls during these episodes and one has dizziness, chest pain, shortness of breath, fainting, blackouts, sometimes syncope. Usually, not a life threatening condition and very well treated with drugs.
Her CKMB and trop levels are within normal limits ruling out heart attack. Cause for this here is probably age related, other causes includes like valve problem, heart blockages, hypertension, thyroid problems.
She ll need echocardiography and thyroid test to evaluate for the cause as early as possible, but not a dire emergency.
The problem associated is increased heart rate and chances of formation of blood clots in heart. So she should on drugs for this, and also on blood thinners to prevent clot formation. I guess she must have been started on this as heart rate in next is low.

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Brief Answer:
Yes she can wait provided she is receiving blood thinners (anticoagulant)

Detailed Answer:
yes, she can wait.
This increase in heart rate is not life threatening, although may cause symptoms.
But it's important that she is started on anticoagulant like xalreto or dabigatran etc. in order to prevent blood clot formation. This condition can be managed well by good MD as well. Echo can be done on Tuesday.

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