As a viewer, I get so tired of seeing Simi worried all the time...
Abhi is the only ray of hope in her life and she shoos him away most of the time.....
I had put my thoughts about that in some other thread. Thought I'll add it here too.
IMO, Simi not showing gratitude at that moment was OK, bcos she had assumed, it to be RB's job, but she gets a punch in the stomach when she knows the truth that it was Anuj, her own brother's job. So, she is really fuming ... [she may say Thank You later on (hope creatives show that!).. ] and wants to take Anuj to task right then and there.... but her previous thanklessness were not justified.
Creatives should use such behaviours only at the right time and not always. Otheriwise it shows the character in a poor light and they have already made her not thank Abhi so many times now.