I hated that that was how she saw FL, but I can see why she thought that. FL isn't pressured into marriage because the previous king doesn't want her to, meanwhile the princess is being pressured despite not wanting the marriage. The previous king and public are showering the FL with attention, even more after learning that the ML is in love with her. So to the princess, she's getting everything she wants and more without being in the scene long enough to work for it. She doesn't see how the FL is being caged and swing around.
Bruh the king is still not letting her meet her lover let alone get married to him . Not to mention how her every family member died and she had to raise that kid singlehandedly (at least that's what the princess knows) . Telling someone like that they're getting everything handed without any effort is wild.
Honestly I understand her, as narrow-minded as it may be. She had the benefits and responsibilities of being a princess since birth, then suddenly someone comes along getting the same benefits but little to no responsibilities.
Imma punch the princess like girl wtf do you mean she got everything hande effortlessly??? Reminds me of when some rich kids whine about their dad not letting them go on a vacation to a foreign country or not buying them the latest iPhone.