At this point, you need to make her feel bad in order to motivate her to return your stuff. People forget about stuff like this. When I 'lend' books, I always assume there is a chance I won't get it back. So I only lend things I either don't care about or to people I really trust, if its a valuable book.
What do you know about her besides her text number? Do you have a mutual friend or something?
Since you recently sent her a message to which she has yet to respond, you should probably wait a few days. If she answers, stay cool like CB suggests. I agree with him BTW, what I said to say and what you texted her don't have the same tone. Don't even ask about a call or get together anymore unless she brings it up. Tell her directly you'd like your DVD and sweater back. Make up some excuse that someone has asked for it and you'd like to lend it to them.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh