Which type of treatment should woman 87 have with breast cancer?

Depends what stage..: ...And how healthy she is. Age by itself shouldn't be the factor that dictates her treatments. If it's an early stage cancer with good prognostic features, she may only need the lump removed with surgery +/- anti-hormone pill. She should hear about all her options from a team of specialists including surgeon, med onc, rad onc and pain/palliative care if she's not in good health.