What is the meaning of this lyric by the Beatles?

Here are the lyrics to She Came In Through the Bathroom Window: She came in through the bathroom window Protected by a silver spoon But now she sucks her thumb and wanders By the banks of her own lagoon Didn't anybody tell her? Didn't anybody see? Sunday's on the phone to... show more Here are the lyrics to She Came In Through the Bathroom Window:

She came in through the bathroom window
Protected by a silver spoon
But now she sucks her thumb and wanders
By the banks of her own lagoon

Didn't anybody tell her?
Didn't anybody see?
Sunday's on the phone to Monday,
Tuesday's on the phone to me

She said she'd always been a dancer
She worked at 15 clubs a day
And though she thought I knew the answer
Well I knew but I could not say.

And so I quit the police department
And got myself a steady job
And though she tried her best to help me
**She could steal but she could not rob.**

Didn't anybody tell her?
Didn't anybody see?
Sunday's on the phone to Monday,
Tuesday's on the phone to me
Oh yeah.


When it says "She could steal but she could not rob", what does that mean?
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