The speed is MUCH improved. Depending upon the phone there are many options (quite a few Android devices can act as hot spots -- for an added monthly fee).
There are also now month to month MiFi type devices which are often preferred because they create a WiFi connection that can be shared by usually up to 5 people.
I think Best Buy is actually selling the no-contract MiFi on Virgin for about $200 and I think Virgin's monthly fee (no contract) is about $40 - $45.
If I were to get a mobile connection today I'd probably first look at the non-contract options which for some odd reason are cheaper per month (they may also have download limits so if she's going to stream Hulu or other bandwidth heavy apps then she may want to be sure she'll have enough bandwidth available on the plan so she doesn't get surcharged).