Just an idea - could you set up a little home corner for her directly adjacent to the kitchen so she can do her own replica cooking - if you can't afford to buy a ready made set you could make one on a kids height cupboard, using cooktop elements drawn/coloured in on paper and stuck down with clear contact and handles made from cotton reels (or cheap handles from Bunnings) and old pots n pans from the Salvos, etc. Kids love to "cook" with playdough, or even some real play ingredients like raw rice, raw pasta, flour, etc. You could also give her a tub of (lukewarm) bubbly water for 'washing up' with her very own sponge etc.

That way when you want to do a 'real' cooking activity with her you can do it when you have the time and attention for it. The rest of the time she can 'cook' in her own kitchen.