No. She would need to get a Comcast account of her own.
You should already know what type of account was needed for you to use Xfinity.
"Xfinity Instant TV Beta" just being offered by Comcast might be a lower cost option for her.
Check the new post on top of the list on this part of forum (Xfinity Stream Website).
Hi bluecedar1, you can assist your daughter with getting set up with Comcast internet. The best way to do this is by going online to our website at www.comcast.com and click "shop/upgrade" from there you can add any other the services we provide. If you already have Comcast services and she just wants to view your account while away from home online then you would just need to create a username/password for her online. This way she can watch thousands of titles from on demand and recorded content from your DVR. If she wanted to view live shows then she would have to be within your home network. Please let me know if you need any further assistance.