Reddit mentions of 3.5mm Stereo Male to 3.5mm Mono Female Adapter

On a £100 budget, I recommend the [£69.98 Tascam DR-05] (http://www.amazon.co.uk/gp/product/B004OU2IQG/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B004OU2IQG&linkCode=as2&tag=hybrcamerevo-21), a [£21.99 JK MIC-J 044 lav mic with 20-20kHz frequency response & >58dB signal to noise] (http://www.amazon.co.uk/gp/product/B00KMILKGS/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B00KMILKGS&linkCode=as2&tag=hybrcamerevo-21) and a [£4.66 Cables To Go 3.5mm Stereo Male to 3.5mm Mono Female Adapter] (http://www.amazon.co.uk/gp/product/B002DWAXLE/ref=as_li_tl?ie=UTF8&camp=1634&creative=19450&creativeASIN=B002DWAXLE&linkCode=as2&tag=hybrcamerevo-21).

Here is why I recommend the JK over the Giant Squid: https://youtu.be/hkLVtPksn2I

With this setup, you will get much cleaner audio - but you will have to sync it with your video in the editing suite.

Hope this is helpful and good luck!

I use an audio splitter with a stereo to mono adaptor on one side of the split, like this.

If I'm doing something by myself, I plug the headphones into the clear line and use both channels. If I'm gaming with my partner, who's sitting in the same room, I plug into the mono adaptor and just use one earpiece, so that we can talk at the same time.

If you only ever use the headphones for mono content (I guess you use speakers for videos etc), you could skip the splitter and just use the mono adaptor directly in line on your headphone cable.

I'm fussy about my headphones too, and I just accept that whenever I need to buy new ones I need to buy several and throw most of them away until I find one that I like. Unfortunately headphone choice is very personal so it's unlikely that anyone will be able to recommend the perfect ones for her.

You don't need special mono earbuds though. If your music player of choice doesn't have an option to play everything in mono then stereo-to-mono adapters are basically free. If she really wants earbuds instead of trying more proper headphones, then look on Amazon for those too. But remember that you'll have the same problems with earbuds as with headphones - you'll have to go through several before you find one that is comfortable and doesn't keep falling out and doesn't get bunged up with ear wax all the time.