#4 Nia Jax

If Paige returned against Bayley, she'd almost certainly be a heel. However, if you put Paige up against the incredibly dominant and imposing Nia Jax, Paige would be a babyface.
Before she left, Paige was adamant that WWE was "her house." However, now that Nia Jax has also returned from a hiatus, she might be keen to establish that she's the unstoppable female wrestler who owns the division.
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It would be a typical 'David vs Goliath' situation with Jax using her size and stature to dominate the smaller, diminutive Paige. It would be a great way to get Paige over, giving her 'Daniel Bryan-esque' booking where, despite her size, she is able to overcome the odds.