From the pic it looks like divider ends at water line. Even with a hood, there is usually a couple inches between hood and water line which is probably enough room for her to jump. One way of introducing a pair of bettas for first time is to put her in clear cup w/ no lid and float it in his tank. The theory is that when/if she is ready to spawn, she will jump out of cup and join him. In the wild, a female betta has been known to jump from series of puddles, streams, etc to reach a males nest/territory.