YOU SAID:

I miss your mum because she was very hot

INTO JAPANESE

お母さんがとても暑かったから寂しいよ

BACK INTO ENGLISH

I miss my mom because she was so hot.

INTO JAPANESE

お母さんがとても暑かったので、お母さんがいなくて寂しいです。

BACK INTO ENGLISH

I miss my mom because she was so hot.