Looking on the internet deeply has found these results:

she is pretty good at dancing is the most popular phrase on the web.

she is pretty good in dancing 10 results on the web	she is pretty good at dancing 13 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Aug 23, 2010 ... ... are so so perfect love them but i more like yuri because she is pretty good at dancing and she has so perfect body love Yul she is a goddess. Feb 13, 2009 ... yellow2brick2road 6 years ago. i think the dance would have looked better in a more flattering outfit. She is pretty good at dancing tho. Sep 10, 2014 ... ... asia.asia should slow down her singing she is pretty good at dancing not trying to say stop singing acting could be great for but the most thing�...

she is pretty good in dancing

10 results on the web

she is pretty good at dancing

13 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Aug 23, 2010 ... ... are so so perfect love them but i more like yuri because she is pretty good at dancing and she has so perfect body love Yul she is a goddess.
Feb 13, 2009 ... yellow2brick2road 6 years ago. i think the dance would have looked better in a more flattering outfit. She is pretty good at dancing tho.
Sep 10, 2014 ... ... asia.asia should slow down her singing she is pretty good at dancing not trying to say stop singing acting could be great for but the most thing�...