Anjana is the one for sure!

Today we learnt that papa hooda is also after the diary ..so that's ruled him out as the hider/briber and Arjun is ruled out too.

That leaves anjana and sakshi ...as it's someone in the hooda house who has hidden it in the ground (since there were hooda family portraits in that room) ..so looks like it's anjana after all ..hence her sudden antagonism towards sakshi (as perhaps sakshi knew of pooja's affair) - also she had walked into arjuns room when he was reading the dairy ..so must have found it and hidden it ..

guess she's the one then paying off ashish too ...as they showed in yesterday's epi that the person hiding the diary and bribing ashish are one and the same ...

pooja must have mentioned ashish in her diary as well ..since he was yash's partner ..and so anjana must be paying him to keep his mouth shut ..

she knows how painful it is to go through a spouse's affair - yesterday she told sakshi that it is worse than losing that person and one can never get over it ...

she doesn't want adi to know the truth ..so she's covering all bases ..

I think the secret pooja knew is that papa hooda had an EMA with pooja's mom ...(I guess that also must be in the dairy which is why Anjana is now rude with sakshi)