I guess Ruhi is not missing.

I mean we know Ruhi.When she came to knew about Raman trying to abort her as child she assumed Raman don't love her then also she was broken and crying but she never left house.

Now she know her parents love her and she will leave house without giving any sign.No one saw Ruhi crying recenly.

But I guess it is plan made by Mrs Bhalla,Amma and hate to say it and Mani.

According to prcap they are supposed to go together but where will they search for her in unknown.

What I know about YHM is Ruhi is more matured than Ishra together so she is just hiding according to plan