Breast cancer surgery needs to be done.

She is a cancer patient, 5 chemo are done surgery needs to be done, but due to changes in ECG it is on hold, but her echo is normal, we have tested ECG 4 times nd it was same in all (it was never an issue earlier), she has diabetes, thyroid, BP, she is taking Ecosprin as well (in dec 2019,it was not heart attack but her blood got thick due to which she felt pain, since then ecosprin started), all the tests are done general physician has cleared for both cardiologist n physician thing but PAC dr wants cardiologist clearance for ECG changes, OPD are closed in delhi, oncologist suggested to get dobutamine stress test and I am not sure if that suits her, she got vaccinated yesterday and she will be taking injection (Filgrastim 300mg) on Mon n tues for TLC, just wanted to know that dobutamine stress echo is required or not, because she is weak and m not sure if she get any reactions, and test is very costly as well, please advice what to do some cardiologist clearance will be enough?