Wild bird seed will not give your chicken the balanced nutrition that she needs. If she free ranges then she will be getting a lot of her nutrition that way simply by instinct. However a good balanced feed is always best. I don't know much about Mash but I did a little research and it appears that it is balanced in the same way commercial feeds are balanced here in the US. You might try the Mash with bird seed as a treat or mixed in with the mash in very small amounts.We are in Sarchi Sur, Costa Rica & would like to connect with someone else in CR. who raises chickens.
The only feed here that I can find is Mash, starter mash & cracked corn. I do give my one hen some cooked rice and she has eaten quick oatmeal (uncooked).
I would like to find a better feed for her. My other 2 hens have died. The second one pining after the first one died.
I will look at the wild bird seed to see what it consists of and maybe try that a little each day.
She does have a large secured yd with lots of greenery growing/sun/shade and seems to be doing well. Not disturbed by the 2 deaths.
Thank you so much,