。
If anything, she's a little better today.
Literal
She [topic-は] if-asked-which today [topic-は] a-bit becoming-better.
よくなる ('become good/better') is the classic X+くなる pattern for change: turn the i-adjective into adverbial く-form, then attach なる. The ~ている form fixes it as an ongoing improvement — she's currently in the process of getting better. どちらかと言えば softens the claim, signaling the speaker's hedge.