is this over the phone or in person that she’ll deal with the receptionist? i am assuming in person? if so, then she should be able to do a lot of pointing to the area affected, and they’ll likely read her facial expressions and if she’s grimacing in sharp pain, they’ll see that.
i think it’ll be important for her to say how long the pain has lasted, if it’s gotten worse, describe the pain (burning, sharp, cramping, etc).
also things like, any problems with other systems? is she ok in the toilet? has she vomited? is it keeping her up at night? can she eat? is it spreading?
apart from those types of things, i think you could type up something for her that says what you said above, that she’s in pain and may want to have x rays/ultrasound done. i agree with @BarbieBF that they’ll do an exam and not just the imaging, but that should be in her best interest.
with #2, the mental attitude…i’m unsure what you mean. if you mean is this serious…it’s really hard to say. i think getting her in to care as soon as possible is wise. then hopefully you’ll be relieved that it’s nothing serious. i would be open minded as much as you can be. much is unknown, but after seeing the doctor you should have some answers.
hope that helps and best wishes to all three of you.