I guess your lack of experience makes it difficult for you to find reasonable steps to narrow down the error. So let me take some shots into the blue...

• The group www-data seems to point to an Debian or Ubuntu system. Correct? This matters because different systems have different configuration defaults.
• ...those scripts the need to write to specific paths... Does it happen only for some paths? What are the permissions for these paths? Even the owner can't write files without a write permission!
• Can the Perl scripts write to /tmp? If yes: What are the ownership and permissions of the files created by the script?
• Can you login as Sally1 and write to said specific paths or does that fail, too? (NERDVANA suggested a similar approach)
• Have you inspected your web server's error log? Are there warnings or errors regarding your scripts or about your configuration?
• Do you have AppArmor or SeLinux policies in place? (Admittedly that's pretty far-fetched, but those could cause such behaviour)

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