Hi, & welcome to the GMB.
If you have a black light, shine it on the shade & if it glows green then it's Burmese. Burmese, whether by Mt Washington or Thomas Webb & Sons, contains uranium & thus glows green under a black light.
Peachblow is a disputed term. A lot of glass manufacturers made glass of this colour scheme, it was very fashionable in the late 19th century. Different firms used different names for this colouration, but collectors & dealers tend to think of all pink shaded glass is Peachblow.
The Mt Washington Peachblow has a pale bluish-grey tinge at the base of the item, shading through to pink. Peachblow by Thomas Webb has a warmer, more reddish pink shading. Wheeling Peachblow is quite orange in tone shading to a reddish-brown. These are just a few examples of different versions of this colour!
There is a book devoted to Peachblow glass, written by Johanna Billings, that examines this type of glass in great detail.
At the moment I can't give an exact attribution. The colour looks like it shades pink to light yellow, which suggests Burmese, but a black light will confirm it.