Overbooking: compensation for a lost hotel night?

I and my girlfriend were booked on the Wizz Air flight from BUD to MLA. At the gate, I was denied boarding due to overbooking.

My girlfriend refused to fly alone and we went to the airline counter where I received a new STBY boarding pass and the involuntarily denied boarding form. I was re-booked on the VIE-MLA flight next morning and we had to buy the new plane ticket for my girlfriend and two train tickets from Budapest to Vienna.

I guess I can apply for:

• 250EUR denied boarding compensation according to EC261
• Refund of my train and airport shuttle tickets

I have two questions:

1. I and my girlfriend booked the flight from the different accounts, so each booking was having its own PNR. At the counter, we were told that her status was a "no-show", not "denied boarding" since she has a separate booking and she actually could fly alone. It makes sense, however, I am still wondering if there is a way to get a compensation for her flight reservation and the train ticket?

2. Since the flight from VIE was scheduled only the next morning, we had to spend the night in the airport of Vienna instead of the hotel in Malta. Obviously, the hotel reservation at that moment was already non-refundable, so in the end, we had to pay ~150EUR for this night anyway. Is there a chance to claim a compensation for this night from the airline?