Student or Learner
Teacher, is there any difference between the two sentences? I think they are the same.
She is only available on Tuesdays.
She is available only on Tuesdays.
Many style guides will suggest that the "only" be as close to the thing it's modifying as possible, making the second one preferable, but no one will misunderstand this.
Compare it, though, to this pair:
She only bakes on Tuesdays.
She bakes only on Tuesdays.
The first says she spends all of Tuesdays baking. Don't ask her to wash your shirts and don't expect the bathroom to get cleaned.
The second says that Tuesday is the only day she bakes. Don't ask for a fresh-baked cookie on Monday.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.