I'd put the dog on lead and walk it to the location you want the dog to learn to use for #2. Repeat daily until the dog figures out that location is the pooping grounds. Having several dogs myself I've noticed that each has their own spot in the yard. Very rarely do I see one using the others "spot". You may need to assign her her own personal spot and walk her to it daily until she figures it out.
Sounds good in theory but she's not regular. For example, after eating at 6 last night she pooped about an hour later (I know because I was outside). She hasn't eaten since and I just saw her pooping in the yard again today which spurred this post.
I'm afraid I'd be standing out there for hours waiting on her to go.