[MRM]

No established company is going to hire a starting artist to (learn how to) create a promo video for them, no matter how talented she is. As Tummy Monkey said above, they have agencies for that. If she wants to produce for large companies (or even really to make a living in that field) she needs to develop expertise and make a name for herself so she becomes a known commodity in that industry. That means she needs to either start with an agency or a company large enough to have an in-house production team.