HI Pam....I'm sure Tally Ho (or some other veteran of the Time Machine) will be around to help you soon, but you might want to take a look at the following excerpt from the walkthrough, if you haven't already:
WARNING SPOILER:
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.Get the “invisible” spell ready, and use it as soon as Ashamira exits. Run to the crates. Push the crate to the left just far enough to clear the other crates, then push it through the door. Near the end of the pushing process, you will be shielded by the other crates or by the wall, and the guards stop shooting at you. Once you clear the door you are safe, for a while. You and Ashamira need to find a way out of this enclosure without going back into the yard where the guards are.
Push the crate against the other nearby crates and climb all the way up to the roof. Ashamira will follow you.
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Love, Witchen =O)