A fish that follows, but doesn't commit to your offering is telling you something. You're doing something right, but something about your presentation failed to make that fish commit. While most gamefish will return to the same haunt given time, an immediate follow-up can turn that fish into striking. Increasing retrieval speed will sometimes produce (after all, she was interested) as the fish won't have as much time to look over your presentation. Adding a bit of scent prior to the follow-up is never a bad idea either, especially on hard baits. If she fails to follow or strike your changed presentation with the original bait, I go with something completely different that can be presented at the same depth. A crank for a spinner, as an example. Many pros will tell you to switch up colors or change speeds, even to let the fish 'rest'. All good advice, but after years of muskie fishing I can assure you of one thing that applies to most game fish. A fish that has shown enough interest to follow is an active fish and your best odds to catch that fish is NOW. If that fish is worth the effort, exhaust your alternatives before abandoning her. I've caught more big fish within 15min.of showing themselves than fish that I've returned for at a later time. Not that I haven't, but even if the fish returns to the same area, it's likely that it's mood has changed. I'd rather go after her right away than take a chance that she'll get more aggressive later.