I suggest you not buy anything new to help her, she doesn't really need it, she has all she needs already!
I know this part is so exciting & you just can't wait for her to be walking all around....but....trust me, you can wait!! Time will fly by SO very fast now that you have your baby, you are going to blink and she will be 5 like my last 'baby'!!
Try to enjoy every minute of this stage, there really is NO NEED to help her progress any quicker than she already is! She has the concept down ! She will learn how to trust the couch & the toy you already have, just you watch!
This is your opportunity to slow down time, seize it with both hands!!! Take LOTS of pictures and TONS of videos of this stage and all her future stages & enjoy every minute of it, she will be climbing up onto that same couch before you know it & running circles around that toy!
Trust me on this! I know and can still feel the excitement of not being able to wait until they start to walk...but I promise you, you will want to wait, you just don't know it yet!
It's totally not fair but incredibly true that once you have children, time speeds up!! It's one of life's mysteries...a cruel, cruel mystery!