You’d think that right..unfortunately the actual ball is extremely hard to move, just try to move the ball forward without the peg. It is stiff as a rock. The peg part adds friction in turn to create the ball to tilt forward and backward. If you glue the peg back to the ball and try to tilt the peg forward or backward it will snap off again. Only solution is to glue the peg directly back to the ball and then stick the foot back in place to the boot hole. It will fit back perfectly, but again , no more movement of the foot in a flex way. But at least you can still pivot her foot side to side and of course get her to stand in place.
Another solution, try to find another foot peg, but as I stated it’s hard to match it because the ball was specially made for her foot in it being extremely large. I tried to go online, but it’s hard to find a match. There is ebay, but no vendor is offering a buy it now auction..meaning all auctions are so far bid only . See if SSC will offer a replacement