@haudyerwheesht M@S have nice diffusers in loads of scents for £10-15. Lots are in the 3for2
Or if she's v chic you could do a little manicure kit - selection of Nails Inc/L'Oreal/Revlon polish from Poundland, glass nail file. Package beautifully
Or you can get nice Nails Inc sets in Boots and similar places - often discounted or in the 3 for 2. If you have a few gifts to sort you can split them and add appropriate other things and box up nicely with tissue and ribbons
Candle might be an option
If you hunt around then you can probably get leather gloves for £10
If she cooks then some ingredients- pink rock salt, truffle oil, a spice kit etc