As a business stand point, there's only so much they can do. It's not like they're going to bury her outside shamu stadium so every one can go grieve at her grave site.
Yes, she passed. On the other hand, most the day visitors that go are not there because of Dawn or to pay tribute to her. And it's much nicer seeing a small planter out front than the stupid PETA people protesting on the median outside the park.
The last time I saw Believe was in May prior to Shamu Rocks starting for the summer, I do believe they had it then. But one of the other passholders around here will have to tell you what's going on now.