New house

Purchasing house with septic tank, owner is old woman who had no septic tank records and doesn’t know when it was pumped last or where it is located, she is offering to pay for it to be located dug up and pumped prior to closing and provide proof our septic dye test came back good should i be worried that there is something wrong with the septic tank? She refused to pay for the more expensive comprehensive testing for the septic tank because she said the dye test passed…

***UPDATE we ended up having to back out of the deal because during the inspection we found lots of disturbed dirt in the yard that had been excavated and when we brought it to sellers attention she gave three different stories of why her “son” was digging for the septic tank in the fall. And then when it came time for her to loacte and pump the septic tank (2weeks prior to closing” she got weird about it and said nevermind she wants to just give us $700 and have us hire someone to do it ourselves after closing, when we pushed her for an answer she got angry and gave an excuse that made no sense….. did i make the right decision by walking? Im thinking there was something wrong with the septic tank and she knew it. Especially because she did this so close to closing and we agreed that she didn’t have to do anything at all from the inspection accept for pumping her septic tank