Is Skin Thickening only in IBC?

Hi everyone, does skin thickening that is shown on Mammogram/MRI/Ultrasound only happen with IBC or can it happen with IDC/DCIS? Is Mastectomy Pathology Dermal Lymphatic Involvement as conclusive as Breast Punch Biopsy? My mom was diagnosed with IDC/DCIS in June. Decided to do Mastectomy first where they found the disease was much more advanced than imaging showed. Her breasts are very dense and imaging could not determine if her cancer was 1 larger mass or smaller tumors. Diagnosis was IDC/DCIS 9 cm 18/19 node positives. Stage 3C ER+/PR+/HER2- She finished AC chemotherapy and currently doing Taxol. The reason for this post is I was printing her documents to keep in a medical folder and the place that did her Biopsy (Contracted facility with medical facility) had an "Impressions & Recommendations" area that was left out of the Medical Facilities report that we received from her team and added to her portal. I am worried they might've overlooked something here.

"Original mammograms were again reviewed. Enlarged right axillary lymph nodes are noted on the original MLO view as well as skin thickening consistent with axillary metastasis and dermal lymphatic involvement. Imaging findings are consistent with inflammatory carcinoma with axillary metastasis."

This section was not on the pathology report that we received from Scripps (Her medical facility). Never did any of her oncologist mention a possibility of IBC. My mom had no idea she had breast cancer, 0 symptoms which is surprising due to the size of tumor and lymph nodes positives. She said she had no breast pain or rashes or any of the symptoms you would usually have with IBC, but her mammograms did show skin thickening on of the affected breast. Her initial biopsy resulted in a ruptured blood vessel which caused large hematomas and caused her entire breast to bruise. So from the time of her biopsy to surgery her breast was pretty bruised so unfortunately the Oncologists never inspected her breasts in "Normal Condition" prior to biopsy. Her Mastectomy Pathology report stated that Dermal Lymphatic Involvement was not present, but I do not know if this is as conclusive as Punch Biopsy. I've researched all weekend to see if skin thickening can be a sign of advanced IDC/DCIS but all these articles and medical reports only mention skin thickening as a sign of IBC. Hoping to get some insight. PS: I have already reached out to her medical team with the confusion on the documents and why IBC was never mentioned as a possibility as shown in the original pathology.