She can also play the piano.对还是She also can play the piano.对?

都可以

如果准确地说的话，应该是
She can also play the piano

also要放在实意动词和非实意动词之间最好。

在这里，非实意动词为can,实意动词为play.

She can also play the piano.正确
因为can 应该用在 also 的前面

第一个。She can also play the piano。
英语中规定also应该放在实意动词后
在这里 放在情态动词can前。

都可以
前者强调她除了会别的还会钢琴
后者强调别人会她也会

后者较合语法,但前者也不错.