Well, I'm not entirely sure. It depends on how popular this particular concept is among the fanfiction writers in that fandom. Some might find it an interesting dynamic to explore, so there could be some out there. You should also check out any dedicated Naruto fanfiction forums where people might recommend such stories.
One possible scenario in this fanfiction could be that Sakura realizes her long - hidden feelings for Naruto when she sees Hinata getting closer to him. She might start to act out in small ways, like being a bit more snippy with Hinata during team meetings or training sessions. However, she also has to deal with her own sense of pride and the fact that she once rejected Naruto.
In such a fanfiction, Hinata might be jealous of Sakura because Sakura could be more popular or confident. Maybe Sakura has skills that Hinata wishes she had, like better combat skills or more outspokenness. Also, if there's a love interest involved, and the guy seems to pay more attention to Sakura, it would make Hinata jealous.
Maybe it's because of Naruto. If Hinata has a closer relationship with Naruto than Sakura does in the fanfiction, Sakura could be jealous. After all, Sakura has her own feelings for Naruto.
Yes, in some fanfictions, Sakura can get jealous of Hinata. For example, if Hinata has a closer relationship with Naruto than Sakura does in the story, Sakura's feelings for Naruto might make her jealous. It could be because Hinata is always so supportive and kind towards Naruto, which Sakura may feel she lacks in comparison.
In many Naruto fanfictions, Sakura can often be depicted as getting jealous quite a bit. She has strong feelings for Sasuke, and when she sees other girls getting close to him, it can trigger her jealousy. For example, in some fanfictions where a new girl character is introduced and shows interest in Sasuke, Sakura's jealous side comes out strongly.
Sakura's jealousy might manifest through her actions. For example, she could be cold towards Hinata when she sees Naruto and Hinata together. Maybe she makes snide remarks or tries to insert herself between them more often.
The jealousy can create conflict. It might lead Hinata to act out of character, perhaps trying to compete with Sakura in ways she normally wouldn't. This can drive the plot forward as it adds a new dynamic to the relationships between the characters.
In the fanfiction, Sakura could be jealous because she has an ego. She might have thought that Naruto would always be there waiting for her. But when he falls for Hinata, it bruises her ego. Additionally, she may have seen Naruto as her safety net, someone who would always support her no matter what. Losing that special status to Hinata makes her envious and jealous.
One possible plotline could be that Sakura realizes Hinata has a closer relationship with Naruto than she does. So, she starts to feel jealous. For example, she might notice how Naruto always seems to have a soft spot for Hinata's gentle nature. This could lead to Sakura trying to prove herself better in Naruto's eyes, like training extra hard or taking on more difficult missions.