prakrit was the language spoken arshoo never was sanskrit a colloquial language and that was also many many years back..
i do think that there were different languages born out of sanskrit all sounding like brother and sister of hindi..(as we have different dialects of hindi today like abhy said e.g. bihari, UP, MP, mumbaiyya, hyderabadi etc and languages too like urdu etc) ... i dont know since when rajasthani or marwadi was born... but it was probably derived from sanskrit.. and the raso readers have let us known it was written in an old form of hindi..so could be that it was written in hindi or revised over the years in hindi - pataa nahin.
but if they are making the serial in hindi it makes sense to show her love letter also in hindi rather than trying to research and use the same form of hindi or marwadi used at that point of time na. 😳
Good points shraddha 👏👏👏, I do agree !