I have a son with profound dyslexia that had (has) similar speech problems at your dd's age. You are wise to keep an eye - and I agree that these kind of issues can be a red flag for dyslexia.
I found the book, "Childhood Speech, Language & Listening Problems" by Patricia McAleer Hamaguchi helpful in understanding many of the issues.
I would also suggest you keep an eye on CAPD issues (central auditory processing). These cannot be tested until about age 8, but I wonder about her word endings, syntax etc. Although her receptive language is strong (as is my son), she still could have a processing issue in some aspect of language that is tripping her up.You may find this website helpful
http://www.ocslha.com/Ferre.htm.
