Thanks susie alotThe amount that needs to be shown depends on the size of the household of the sponsor plus number of intending immigrants to be sponsored.
You can see the amounts here https://www.uscis.gov/i-864p Although some people say the i134 only has to be 100% of guidelines we have heard of embassies requiring 125% (same as i864). The household size used must include the immigrants example if it is her and one other in her household now and she is sponsoring only you, choose 3 in the household table.