My brothers fiance makes me feel isolated and lonely. What can I do about this?

My brothers fiance will talk to anyone else and ignore me. I try to make conversation and she won't talk.

My family say she is just shy but when we went out for my younger brothers 21st she would talk to my brothers and ignored me. Thus was when the 5 of us arrived at the venue.

When she arrived at the house my brother she is engaged to said hi to me and she just continued looking at her phone. My brother made conversation with my while she stayed silent.

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My mam wasn't happy with me when i stuck up for my brother when his fiance would put him down, saying he didn't know how to do certain things, that he takes his time and other stuff
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Someone in the family brought up about my eldest broghers wedding and all i said was i can't wait to see what the bridesmaid dresses would be like. I was given out to by my mam for saying that
My brothers fiance makes me feel isolated and lonely. What can I do about this?
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