Vendor issues! Help!

Hey everyone! I’m in need of some advice and opinions! The photographer I hired for the wedding is absolutely awful with communication, to the point of it taking her 2+ weeks to get back to me and answer a question. I completely understand photographers are BUSY and have a lot going on! The issue that I’m having is that this particular photographer can post on multiple social media platforms numerous times without responding to my messages or emails. We initially put a deposit down last September for a package that came with an engagement session included. Our wedding is this coming September, three months away. (I understand everything g has gotten crazy with COVID, that is something no one can help or bell blamed for.) Our engagements were just done in May, when we were told we would have our gallery within the week. We are now entering the fourth week post engagement session, no gallery. And yes, I have reached out. But the photographer is yet again posting from sessions she has done since ours all across social media. With the inability to have proper communication with the vendor, I’m honestly pretty frustrated. My question is this, would it be unacceptable to drop them from my wedding? What would anyone else do in this situation? I’ve been having communication issues since we booked. My first engagement session was canceled by the photographer, but then posting about it on social media, and not contacting me directly until I reached out and was contacted back the day before the session was supposed to happen. I know I signed a contract, but if the photographer doesn’t actually shoot the wedding, is there anything that can happen? Any advice is greatly appreciated! Sorry for the long post!