My beagle dog got spayed on Thursday and today is Sunday it seems like she has a week bladder since then is that common or not

She just had the equivalent of major surgery on her insides. Give her some time to properly heal. Just let her outside more often for the next two weeks or so.

The third day post surgery seems to be the worst for animals and people. It may be that it is uncomfortable to get in the position to urinate, so she just lets go wherever she is. Hopefully you will start to see some improvement in a day or so.