Transferring content

There is no way to transfer content between accounts. However, you can access the content if you are using the same console that she purchases the content on.

License transfers are used to transfer console licenses between consoles, not accounts.

Ok but this what it says at the support site

"Transfer content licenses

You can transfer content licenses from one console to another once every four months.

If your console was recently repaired, or if you’ve purchased a new console, use the license transfer option on your console to transfer content licenses. Here’s how:

On your console, sign in to Xbox LIVE using the gamertag that you used to purchase the content.

Go to the Settings, and then select Account.

Go to Your Billing Options, and then select License Transfer.

Follow the on-screen instructions to transfer the content licenses.

After the licenses are transferred, you need to download the content again to update the local licenses. This way the content can be used by other profiles on your console and when you’re not connected to Xbox LIVE.

this last sentence says any profile can use the content as long as you did a " transfer content licenses' i did and license transfer and the DLC does not work

Spyroman - License transfers only move content between consoles. It does not transfer content between accounts.

Are these the steps you tried?

Copy or move multiple items using the Transfer Content option

You can use the Transfer Content option to move multiple items between storage devices. Here's how.

Notes

• The Xbox Dashboard is not available during content transfer.
• If the content transfer is interrupted for any reason, the content remains on the source storage device, and you can restart the content transfer process at any time.
  
• If you’ve purchased a new Xbox 360 console, you can use the Transfer Content option and the Xbox 360 Hard Drive Transfer Cable to move your Xbox 360 content to your new console. For more information, see
  
  Use the Xbox 360 Hard Drive Transfer Cable.

1. From Xbox Home, go to settings, and then select System.
   
2. Select Storage.
3. Highlight the storage device that contains the content you want to transfer, and then press
   Y for Device Options.
4. Select Transfer Content.

I've seen the complaint about the Halo 4 content before but I'm not aware of a resolution at this time.

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For the other content, have you performed a license transfer? Please note that this is different than just transferring the content although the content transfer is part of the license transfer process. You can do it from your console under Account Management.