Need some advice ?

Hi my mom got diagnosed with TNBC back in December and she's almost finished her chemotherapy. She did 12 weeks taxol with carboplatin every 3rd week  and know finishing up her AC chemotherapy. The diagnosis was stage 2 (2.5cm)tumour grade 2 and the doctor said it was contained and no lymph node involvement and it was caught early.

Just have two questions what is the prognosis for this and how big could a tnbc tumour grow in 5-6 months cause she was meant to have a mammogram in June or July and she cancelled due to a broken arm. She was running to the phone cause I was calling her probably for something stupid and she fell and I feel reasonable that the cancer wasn't caught earlier but the doctor said because tnbc grows quick maybe it wouldn't of shown up on the mammogram just looking for some advice thanks