Lisa isn't a "native english speaker", she's English (aka not American) and I can't fault her grammar unless I look at it like an American and then sure it might look a bit funny. As one of your countrymen would say (Bill Bryson) "we invented the language old chap, you lot just added colour" (or color if you prefer)
Lisa has not only been on these forums for a great deal longer than you Raimundo, but is currently being grilled (in what appears to me as a derrogatory remarks) by you on a post which she started merely to try and help other forumites out of a sticky situation. Something she has no obligation to do, I might add, but which I'm sure is appreciated by them.
If you want to know more about Lisa and her "hidden agenda" I suggest you rifle through the hundreds of posts which were posted on these forums before you joined and which you obviously haven't read yet - you can read her posts and figure it out for yourself.
You obviously have a vested interest in promoting your own forums - doesn't take a genius to figure that out, the same way an agent who is here to promote something on these forums would be here to promote real estate they are selling.