我曾经收到她的三封信.是这样翻译吗?I have ever heard 3 letters from her.

恩是这样子的,你都自己把答案说了.
再问： hear from 本身不是有收到……来信的意思吗？在加3 letter会不会重复？
再答： 恩是这样子的，的确不怎么常见这种说法，一般是I have ever heard from her 或者I have ever received 3 her letters