Hello and welcome. My name is ***** ***** I have been in the dog field for 25 years.
If you need her to get to a standing position which is difficult you will probably need to help her in some way.
There are braces you can buy with handles on them which go under the dog and you can then lift the dog from a laying position.
If she is taking metcam that will help with inflammation and pain but I would also add some daily cosequin and coconut oil for her joints.
Here are examples of lift braces, but in a pinch you can help by putting a beach towel under her and lifting the hind area.
information on cosequin
coconut oil dosing