Hi
I have a Bella as well
I have a 2 1/2 yr old Bella and a 5 1/2 month old pup Harley....my 2 yr old is fully house trained...my 5 mo old is coming along very nicely...he is already sleeping with DH and I with no accidents at all
but he is still not fully house trained to have full run of the house...I don't trust him enough for that yet but he is getting there
First what you need to do it confine her, don't let her have full run of the house anymore...you are starting from the beginning again with potty training..buy a x pen or play yard...I like the play yards I have 2 LOL...second I would get a good odor cleaner like Natures Miracle...you can get in pet smart, clean all the areas that she has pottied in with water and vinger let it dry and spray the natures miracle on it to remover the odor...you may not be able to smell it anymore after cleaning but she can and will use that spot again if you don't use the natures miracle.
you are going to have to start from the beginning with her and thats means keeping her confined when you can not watch her at all time...I would start off taking her out every 2 hours and after eating/drinking and any kind of play...when taking her out look at her and say gotta potty and go outside...keep saying go potty for pee until she does...when she does throw a potty party give her, her favorite treat and tell her what a good girl she is
and if its time for her to poop as well tell her to hurry up....I do "go potty for pee" and "hurry up for poop"..I know she won't do both everytime but you should have an ideal of when its time for a poop...if she potties outside when you go back in let her stay out of the play yard for a bit with you having an eagles eye on her at all times...again don't let her have full run of the house...if you can't watch her put her in her confined area...if you catch her in the act correct her with a firm no, that should get her attention enough to make her stop peeing and take her right outside don't wait and say go potty good girl, letting her know its ok to potty outside..you have to be very consistent with them...set her up for success don't give her a chance to fail...and success starts with you
and please know its going to take longer than a few months to train her, it might take 6 mos or even a year to get her fully house trained so please keep that in mind and be patient...if you are consistent with the training she will get it
Here is the play yard that I have for my 5 month old pup..you have to order it online they are not in any stores that I know of I got mine off of Ebay xpens/play yards for pets/dogs....they are big enough for food/water/bed/toys. I would NOT put any potty pads down in her confined area at all that will just confuss her by saying its ok to potty in the house...she is 8 mos old still very much a puppy...she can probably hold her potty for like 3 to 4 hours...but I would start off with going outside every 2 hours for a week or so and than move up to 3 to 4.
I love the plays yards cause they have a floor in them just in case they do have accidents and a mesh top that can be zipped up if you have a climber
good luck...hope this helps