She'll deserve it when she has earned enough points. Obviously her current play isn't enough to get her the points she needs to take the top spot. She's not currently playing well enough and consistently enough to get those points. So right now her ranking points say she doesn't deserve it.
Petra without even trying hard like halep n wozniacki already have 25 titles n 2 slams. Wish she tried hard like them. She would've won more than 2 slams
If you consider 2x Wimbledon trophy, 1xGrand Slam finale , 3x Grandslam semifinals, 6x Fed Cup trophy,1xHopman trophy, 27 WTA titles, 7 ITF titles and no.2 in WTA ranking to be a failure then you must be complete idiot! 😁