That is the $64,000 question
Could be +ve reasons - like she can't be arsed / isn't easily able to sort accomo. Generally not a good sign
Could be -ve, like she ain't much like the pics. And when she rocks up the punter decides WTF - she's here & i've blown my chances of organizing an alternative. Proceed
Better if they offer incall & outcall
Why would a girl like this only be offering outcalls?