Anyone had Immunotherapy or Maintainance Therapy when HRD Negative?

I’m reaching out to connect with anyone who may have experience with a similar cancer diagnosis or treatment journey, as my wife has recently been diagnosed with Stage IIC Ovarian/Endometrial Cancer.
The doctors were unable to definitively confirm whether the uterus or ovary is the primary site of the cancer. We learned about the diagnosis after my wife underwent surgery to remove her uterus, both ovaries, fallopian tubes, and a lymph node from her right pelvis. Unfortunately, all of the tissue samples came back positive for cancer, and the lymph node was classified as Grade 3.

This has been an incredibly difficult time for us, especially since my wife is only 41 years old, and we have two young daughters, aged 10 and 7. Following her surgery, she was offered six rounds of chemotherapy and radiation therapy afterward. We’ve just completed the second round of chemotherapy, and she is managing okay, though she’s experiencing some side effects.
Last week, we received the results from a germline test, which showed that she is HRD negative, as well as negative for BRCA1/2 and other mutations.
Given this, I’m reaching out to ask if anyone has encountered a similar case and whether you might have suggestions for any treatment after or along with chemo, as immunotherapy or other approaches, that have shown promise. Any insights, advice, or personal experiences would be incredibly appreciated as we continue to navigate this challenging journey.

Thank you so much for your time and support.