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I think you'd be better off asking her about it.
I think you need to ask her about it.
You might want to ask her about it.
Perhaps you would like to ask her about it.
I recommend that you ask her about it.
It might be best if you ask her about it.

Are they all correct and polite when you suggest someone?
Thanks
Comments  
Hi Lij,

The short answer is "yes."

I think number one could be a little pushy, even sarcastic, depending on context. (Better off than what?)

Best wishes, - A.
AvangiBetter off than what?
Understand!
Thanks, Avangi.
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LiveinjapanAre they all correct and polite when you suggest someone?
I think I should've written 'when you suggest that someone do something.'
True. Unfortunately, I can't think of a stand alone verb with the meaning you intend. We need one. (But I knew what you meant.)
Thansk, Avangi. Maybe...., when giving advice.
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Liveinjapan Maybe...., when giving advice.
That works.