Can website display issues on certain platforms affect a website's search rankings and potentially hinder any SEO efforts?
I don’t know what you mean by “even perform SEO”
The fact of matter is that if the Site doesn’t render properly on Mobile devices it will affect your position on Mobile search results.
That beings said, if by performing SEO you mean she is editing your HTML, then yes She is right to ask you to finalize you HTML prior to her changing it (or making change recommendations).
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It's possible that display techniques might cause problems with SEO. I'll go over a few but without more specifics it's hard to say if what you're doing will cause problems or be unimportant.