Are you waiting until after your little girl has been spayed?
And chipped
When i let out for the first time i open the door and let them go at their pace, simon was straight out having grown up outdoors but the other 3 took the best part of 2 weeks to venture past the doorstep!
I let out for first visits on an empty tummy and i also have food related recall with my cats, a shake of biscuits of whiskas temptations and they return
Choose a day you can stay home so if they adventure off you dont have to dash out.
Although 6 months is a common age to give freedom i still feel they need supervised outings, they are still small and innocent enough to get into trouble/picked up by a well meaning rescuer. Abit like letting a toddler out, big enough to walk and play but a lack of common sense
Its also wise to keep in at night