lump question? Worried?

Little background... Last month my mom was diagnosed with cysts. Apparently normal with women going thru menopause (her doc said). But she was sent to a specialist, just to make absolutely sure. she also had a mammogram and ultrasound of and showed nothing of concern (just my ). She also was checked a few weeks ago for her annual pap/ check and they were good. Last week at her appt at the specialist, she felt something 'different'. She said she really didn't think it was cancerous but it just felt different than the other side. So she wants her to get an MRI done and come back in two weeks. She didn't feel it when she was laying down but she felt it after she sat up. She said it felt like a pebble and was 'floating'. Whatever that means! Now my question is if she was really worried about it (the doc), wouldn't she rush to get the test and followup appt? And could this just be another cyst? My mom is freaking out and stressing big time and I am worrying too! Wel the doc wanted to send her to the MRI b/c my mom's sister was just diagnosed with cancer last year so they didn't want to take any chances. But if she thought it was cancerous, wouldn't they hurry up and find out rather than dragging it out for a few weeks to a month? Her appt for the MRI is on Fri and her followup appt isn't until the NEXT Fri. And the appt that she felt something was practically 2 weeks ago!