While a week without her may turn out good, it will also be a headache for the makers... what would they do if they learn the FL of the show is actually not required - a big goof up that they cant do anything about now.
I am guessing they have stopped showing Mohan-Tulsi fbs because they dont want it to be seen as a better pairing than Mohan-Radha -- the 'wondrous pair of divine love'. Guess after 'Baake Bihari' blessing her with the flying sindoor, they may feel safer to show some flashbacks. The love anyone notices then between Mohan and Tulsi will be deemed 'not so great' as the one that is coming with the stamp of divine approval. Who cares if he doesn't even want to get married? Who cares if Mohan-Tulsi / Shabir-Keerti look better together... Jodi to yahi banegi.
[Btw... kudos to them for showing something we haven't seen between Abhigya with Mohan-Tulsi... him showing arti to her.]