I have adopted dogs from 3 years to 7 years and have had plenty of time with them.
Have her vet checked and spayed. During that recovery just gently become friends and learn the routine. Give her 1-2 months to just get used to the new home and for you to learn what she knows and does not know.
Then, take her to a good training class. The best thing about training class is not that they learn sit or down, it's that it helps for a team with the members of the family and strengthens the bond. Take her through a class or two and it will be very very good for all of you, not only for skills but for the relationship.
I love adopting adults.
Cara -- Central CA
+ Shay -- GSD
+Melody Rose & Cubby Shelties