I agree with everything Linda has told you. In actual fact, I tried tracing Vera Knight and found exactly the same information as she did.
To make sure you are on the right track, you really need to buy some certificates now and then, otherwise you have no proof of anything.
When you are researching on Ancestry, try using the search column as much as you can. There, you can search for births, deaths and marriages - and census returns are also a great way of finding out information. For instance, now that you know that Florence A.M. Barratt is very likely your ancestor, and you know that she probably married George Knight 3rd qu 1923, this means that she might be on a census for 1911 as a young girl, and if you found that census, it may well give the names of the family she was born into.
You might also care to go to Search and look up Family Trees. Type in a name and see if anyone else has them on their tree. Often, you can find out heaps of info from a public tree.