Are we going to get more information? Are you presenting this as a scenario to be worked?
Pulse, BP, Monitor and temp?
Can we get a better description of the pain: frequency, length of pain, nature/character of the pain etc. Hx of any recent poor health/infections? Hows her skin?
And of course all the normal stuff...allergies, meds, medical problems, risk factors (smoker, diet, weight, stress, family hx etc).
It does sound a bit like precordial catch syndrome, I get that with frustrating frequency...quite uncomfortable too, but better to ask all those questions seeing as though you're there.
If you aren't asking for educational purposes but rather for yourself or someone else..you're an idiot - go to the doctor mate

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(Unfortunately, I feel I have to point out to the mods, lest I get another wrist slapping, that the use of the word idiot was lighthearted and not at all a genuine attempt at an 'personal insult')