Well, depending upon how long it’s been since you last played, a lot has changed.
Alani’s hp has dropped precipitously (she’s got only marginally more hp than Mellka, who has the lowest TTK in the game), her Geyser has been dramatically shrunk and the duration shortened to 1 sec, and Riptide’s damage has been reduced (especially damage via Wave Shock) and the CD extended. Her base attack speed was also reduced but her attack damage was increased; also, they finally gave her a normal sprint speed so that she’s actually got a faster move speed than she used to.
While it’s not explicitly a “nerf”, they also reordered and changed a number of her helices, most significantly moving the 20% attack speed/.5 sec CD reduction on a Torrent hit down to level 7 from level 3 (and swapping in the old level 7s to level 3). It made level 3 a much more balanced helix but really hurt her early game performance.
Alani’s been hit pretty hard. The Riptide nerf that happened a month ago really hurt her early and mid-game performance without significantly impacting her late-game performance (if you take GwtF; if you take Whitewater, you’ll still feel it).
Worst, in my opinion, is Bea’s ridiculously easy method of wounding targets at range. Afaik, there isn’t a visual indicator for when you’ve been wounded so it’s pretty easy to waste a 3 stack Wellspring heal and get pretty much nothing out of it because you didn’t know you were wounded.
With Bea around, I’m definitely not feeling confident with Alani. She used to survive by being able to self heal (and avoided wounds because they were almost all melee), but, with copious numbers of Beas around, it’s almost like your heals don’t matter at all.