What's the meaning of "for all the good it did"

[chebu]

Could anyone teach me the meaning of "for all the good it did...".

It's on the following sentenses of a novel.

Immediately, she (Laurel) heard her sister, Thalia, say, "You're wrong."
"What?" she said.
She looked around, but Thalia wasn't there. Thalia was in Mobile, or Timbuktu, or hell, for all the good it did Laurel.

 

[Anglika]

Could anyone teach me the meaning of "for all the good it did...".

It's in the following sentences of a novel.

Immediately, she (Laurel) heard her sister, Thalia, say, "You're wrong."
"What?" she said.
She looked around, but Thalia wasn't there. Thalia was in Mobile, or Timbuktu, or hell, for all the good it did Laurel.

Thalia's location [not being with Laurel] does not benefit Laurel's situation.

 

[chebu]

Thalia's location [not being with Laurel] does not benefit Laurel's situation.

To Anglika

Thank you again for your kind instruction! :-D