Why did my property taxes triple after buying from a senior citizen?

We closed on a house back in March that was owned by an elderly widow who'd lived there since the 90s, and everyone kept raving about the "insanely low" taxes, which is honestly part of why we overbid by about $8k. This week our first full tax bill came in almost triple what she was paying, and apparently it's because of some senior tax freeze that doesn't transfer to us. Is there anything we can actually do about this, or did we just get stuck?