I believe that she is an attention seeker.
You may wish to talk and educate her when opportunity arises.
Example, when children of her age are walking, you can highlight to her and praised the other party for being an understanding gal.
Also, you may wish to praise her clothes that we is wearing, in this way, to stay pretty and noticeable by others, she needs to walk by herself so that everyone can admire her nice clothes.
If still doesn't work and you wish to carry her, get a babywearing sling or a hip seat carrier.
It does help to ease your shoulder burden a little.
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