I can think of a few options:

1) Consider looking into "kinks" that might excite her. It could involve adding other people to sexy time.

.............You bring up interesting scenarios, But she won't even watch porn with me ! I know she's been with other guys but she plays the prude with me.

2) Talk about open relationship, or at least being able to have sex with others.

................ I don't think she would care if I cheated, so at least to get me off her back ! She says she's not interested in sex anymore.

3) Ask her to help you get off, like her using hands instead of intercourse.

................We can't have intercourse anyway due to her hysterectomy and lack of hormones , ( according to her ). She won't use her hands or any other way to help me get off. She won't even touch me !
She'll let me touch her but I have to masterbate myself which is getting old already.

However, you can't force her to have sex woth you if she doesn't want to.