Realistically, her stepping aside serves her party's goals more than her becoming PM, because:
1. it avoids the divisiveness and xenophobia associated with a Caucasian leading the second-most populous (Asian) nation in the world
2. she will come across looking honourable and self-sacrificing by stepping aside
3. she will still have a say behind the scenes
It's was probably the pragmatic decision to make. Though the pressure that certain groups brought to bear on her (threats to life, assassination, etc) are disgraceful to say the least.
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