Hi Jen,
Yes, splenic sarcomas (non-hemangiosarcoma) occur with some frequency. I see a number of them a year. Splenic sarcomas generally have an aggressive behavior with high met rate. Prognosis for most is around 6-8 months with surgery alone. This of course depends on the mitotic index and subtype. Given that this one has metastasized, we are already behind the eight ball. I'd be aggressive.
Lacking a tongue and pulse, XCHT and modified XFZYT would fit what I usually end up reaching for in these guys.
I've also used the HSA modifications of CHJLGMLT if there is more heat. In the face of mets, I really feel the XCHT is an important formula. As far as the XFHMY, my thought would be that it would depend on how the patient presents to you. I've never used that formula for an internal tumor, myself. Certainly the splenic sarcoma is the bigger life-threatening issue here. The mammary tumors are likely to be a non-issue unless she gets others.
Personally I usually don't use TYT+XYT as first line treatments for something like this. But others may have a different opinion.
Erin