这是我的妈妈她又矮又瘦用英语怎么说

"My mother is short and skinny" 可以说成 "My mother is petite and slender."
"Petite" 在英语中通常用来形容女性，意思是矮小纤细。"Slender" 意思是纤细。
例句:
She is petite and slender, with delicate features.
她矮小纤细，长得精致。
He preferred petite, slender women with long hair.
他喜欢长发的矮小纤细女性。
She looked petite and slender in her evening gown.
她穿着晚礼服显得矮小纤细。