placing a word doc into indesign using the preserve styles and formatting doesnt place the whole doc

Just to add to some similar suggestions: it's very common for a Word file, especially one with any 'complex' formatting such as end notes and tables, to jam on import. Some number of pages will load adn then it will stop.

As noted, look for an overflow indicator on the last page. Add a document page after it. Click on the overflow indicator, then click with the loaded cursor in the new, added page. Many times, that will force the flow to complete. You may have to do it more than once if you have the usual complicated variations something like a dissertation contains.

But think of this as a cyclical effort as well. You may find that it's easier to go back to (a copy of) your Word file and do all kinds of cleanup and format fixing, then reimport it, until you get a truly acceptable result you can use to expediently reformat and finish. Sometimes it's easier to fix problems in ID; sometimes it's easier to go back to Word and make wholesale fixes, then start over.

@kate_elizabeth_bridge0931

As others said - there is something in your text, that's way bigger than the size of your last TextFrame - piece of text or graphic or table.

If you have WORD installed - and not everything is correctly styled - you can use macro that I've co-crated: 

https://www.id-tasker.com/uploads/WordStyle.zip

It will convert Bolds, Italics, Sub/Super Script, Underline and combinations to CharStyles. 

It's very likely that something in your Word file is set to go wider than the measure of your text box in InDesign. Check right indents, tables, images — that kind of thing. One way to check for this is to increase the size of the frame on the last page of the document to see if things snap in to focus, so to speak. 

Any possibility that the "missing" part of the text is actually showing as overset (red plus sign in the last threaded frame, lower right corner)?

If it is, the put your cursor after the last character showing and press Ctrl/Cmd + Y to pen in Story Editor and have a look at waht is happening after that point that is keeping the next portion from fitting on the next line. Often caused by a string of non-breaking spaces between words and no hyphenation allowed, for example.