这句话没错。 行了/够了= Enough with compliments. B feels A was exaggerated in paying compliments to herself, which makes her a little uncomfortable. Saying "行了/够了" is to stop A from saying that with a impatient/joking tone, which implys A didn't say it genuinely.

不能说不对，通常这样回答会被认为是一种很不耐烦的态度，不愿意和这个人交流的表现。

你真漂亮 还好还好 soso 谦虚qian1xu1的回答 行了行了，别说了，你很烦。。。。