The Ladies British Amateur Open is being played at North Berwick West Links this year 6th to 8th September. (Practice rounds on the 4th and 5th)
The handicap limit for entry is 6.4, but because the field is not usually full due to the time of year it is played, its likely that anyone off 6.4 or less will get in.
Most of the really low European amateurs are back at University so those studying abroad are unable to play hence the field size always being small.
The maximum field size is 120 and there are only 60 players entered so far, closing date for entries is 14 August. I think the entry is £40/£50.
Finding further details of the British Ladies competition is really quite hard  – Scottish Golf refer you to the R&A and then you have to search. It seems that players are probably best to contact North Berwick GC direct and details are below.
The North Berwick Golf Club
New Club House
Beach Road
North Berwick
East Lothian
EH39 4BB

Ladies British Amateur Open