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The slip your girlfriend obtained says
You may need to contact the operating airline at the connection city for your boarding pass.
The "operating airline" is (basically) the airline who owns the plane, hires the flight attendants, and so forth. In this case, it would be BMI Regional, so that's who you should contact.
If your girlfriend is still in the secured region of the airport, then there may not be a need to go to the front desk check-in area. (If she were to do this, she'd then have to go through the security checkpoint again, which would be a hassle.) Frequently, airlines will have "customer service" desks inside the secured area, especially at airports where they have many flights (which applies to BMI and Brussels.) If you can't find such a desk easily, talk to any BMI gate agent who isn't busy and ask them what you should do; they will be happy to tell you where to go and what to do.