Hi Megan,
I am sorry, but if she isn’t taking actively any of that position by her self you are putting her in the same. I believe you that she is happy every baby is in upright position, she maybe even is crying for you to put her up. I can understand that it is absolutely normal. But problem is that you show to her to early what is like in upright position. And you did show to her, because even if you think that she is taking mentioned positions by her own she isn’t, you are putting her in sitting on the couch ( that is passive sitting she didn’t take any of that positions by her self), you hold her hands wile she walking etc. You are interrupting with her normal motor development. She suppose to be going into phase trough phase, first holding head, then having normal reactions ling prone, then to turn on stomach, steady on her arms and have good balance there, on all for, roll to side and sit, crawling, high all for, kneeling and upright in standing caching balance in standing etc… (and this is very, very short). Best thing is to let her take position her self, if she can’t then she isn’t ready yet for that phase it is simple as that. Sorry for the bad English, if I get something written wrong our colleagues who work in pediatrics will correct me.
I know you love your child very much, that’s why you do all that. I see every day that parents think that their child is super human, but there is normal development of one baby, takes time for central nervous system to mature and that all goes in some order with minor variants.
Your original question was does it is good for your baby for sit and stand at such young age, answer it isn’t. It is bad for many reasons for her spine, knees, hips, ligaments, not now she is not in pain she is happy for psychological reasons but you don’t want her to have any problems of musculoskeletal nature later in her life time, because you love your child. I know you can’t put her back in lying position but, my advice is put her on floor on mat trace or blanket where she can be safe ( nothing dangerous that she could reach) and play with her.
I hope you did not understand me wrong, my intentions was not to confuse or worse to offend or afraid you. I don’t believe that you did something that big that is bad for her, but if there is reasonable doubt - why taking a risk?