Temperament after spaying

Maggie is having her second season at the minute and I have an appointment with the vet to discuss when to neuter as she only went 3 1/2 months between season 1 and 2 (the vet wasn’t worried about this but we need to decide how long to leave it before we spay her).
She is 15 months old now and still a gobshite in a fun way.
She is my first bitch to be spayed (we had an entire rottie bitch when i was younger) so shall I expect to see a difference in her in any way? Or is that all nonsense?

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