What Does This Mammogram Test Result For Breast Cancer Indicate?

Hi doctor my mom was diagnose as a breast cancer stage 2, i went for mammogram test ths whats the content No previous study available to compare with. There is dense fibroglandular tissue witch limits sensitivity of the examination. Thre is a possible rounded density noted in the cc view of the right brest and not seen clearly on the MLO view. It measures about 1.5cm. The exact location is uncertain. No associated calcification. No achitectural distortion. No suspicious microcalcification. The skin and nipple are unremarkable. Impression: Possible density in yhe right breast as described. Furthr evaluation with ultrasound is highly recommended. BI-RADZ zero Doctor pls explain to me what all ths mean clearly as im too much worried and what should the next step should i do to preveng ths before its too late